MFC r355940:

Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo". That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.

Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo". That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.

Merge commit 371ea70bb from llvm git (by Louis Dionne):

[libc++] Harden usage of static_assert against C++03

In C++03, we emulate static_assert with a macro, and we must
parenthesize multiple arguments.

llvm-svn: 373328

This is a follow-up to r354460, which causes errors for pre-C++11
programs using <cmath>, similar to:

/usr/include/c++/v1/cmath:622:68: error: too many arguments provided to
function-like macro invocation

Reported by: antoine
MFC after: immediately (because of ports breakage)

Merge commit e8316372b from llvm git (by Louis Dionne):

[libc++] Add `__truncating_cast` for safely casting float types to
integers

This is needed anytime we need to clamp an arbitrary floating point
value to an integer type.

Thanks to Eric Fiselier for the patch.

Differential Revision: https://reviews.llvm.org/D66836

llvm-svn: 370891

Merge commit b92deded8 from llvm git (by Louis Dionne):

[libc++] Move __clamp_to_integral to <cmath>, and harden against
min()/max() macros

llvm-svn: 370900

Merge commit 0ec6a4882 from llvm git (by Louis Dionne):

[libc++] Fix potential OOB in poisson_distribution

See details in the original Chromium bug report:
https://bugs.chromium.org/p/chromium/issues/detail?id=994957

Together, these fix a security issue in libc++'s implementation of
std::poisson_distribution, which can be exploited to read data which is
out of bounds.

Note there are no programs in the FreeBSD base system that use
std::poisson_distribution, so this is only a possible issue for ports
and external programs which have been built against libc++. Therefore,
I am bumping __FreeBSD_version for the benefit of our port maintainers.

Requested by: emaste
Security: potential OOB read
MFC after: 3 days

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
9.0.0 final release r372316.

Release notes for llvm, clang, lld and libc++ 9.0.0 are available here:

https://releases.llvm.org/9.0.0/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/tools/clang/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/tools/lld/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/projects/libcxx/docs/ReleaseNotes.html

PR: 240629
MFC after: 1 month

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
the upstream release_80 branch r355313 (effectively, 8.0.0 rc3). The
release will follow very soon, but no more functional changes are
expected.

Release notes for llvm, clang and lld 8.0.0 will soon be available here:
<https://releases.llvm.org/8.0.0/docs/ReleaseNotes.html>
<https://releases.llvm.org/8.0.0/tools/clang/docs/ReleaseNotes.html>
<https://releases.llvm.org/8.0.0/tools/lld/docs/ReleaseNotes.html>

PR: 236062
Relnotes: yes
MFC after: 1 month

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
the upstream release_70 branch r348686 (effectively, 7.0.1 rc3). The
release will follow very soon, but no more functional changes are
expected.

Release notes for llvm, clang and lld 7.0.0 are available here:
<http://releases.llvm.org/7.0.0/docs/ReleaseNotes.html>
<http://releases.llvm.org/7.0.0/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/7.0.0/tools/lld/docs/ReleaseNotes.html>

PR: 230240, 230355
Relnotes: yes
MFC after: 2 months

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
5.0.0 (trunk r308421). Upstream has branched for the 5.0.0 release,
which should be in about a month. Please report bugs and regressions,
so we can get them into the release.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

MFC after: 2 months

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
4.0.0 (branches/release_40 296509). The release will follow soon.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Also note that as of 4.0.0, lld should be able to link the base system
on amd64 and aarch64. See the WITH_LLD_IS_LLD setting in src.conf(5).
Though please be aware that this is work in progress.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/4.0.0/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Jan Beich, Antoine Brodin and Eric Fiselier for
their help.

Relnotes: yes
Exp-run: antoine
PR: 215969, 216008
MFC after: 1 month

Upgrade our copies of clang, llvm, lldb, compiler-rt and libc++ to 3.9.0
release, and add lld 3.9.0. Also completely revamp the build system for
clang, llvm, lldb and their related tools.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm, clang and lld are available here:
<http://llvm.org/releases/3.9.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/clang/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Bryan Drewery, Andrew Turner, Antoine Brodin and Jan
Beich for their help.

Relnotes: yes
MFC after: 1 month

Update libc++ to 3.8.0. Excerpted list of fixes (with upstream revision
numbers):

r242679 Implement the plugin-based version of std::search. There are no
searchers yet; those are coming soon.
r242682 Implement the default searcher for std::experimental::search.
r243728 Add <experimental/any> v2.
r245330 implement more of N4258 - Cleaning up noexcept in the standard
library. Specifically add new noexcept stuff to vector and
string's move-assignment operations
r245334 Fix PR22606 - Leak pthread_key with static storage duration to
ensure all of thread-local destructors are called.
r245335 Fix PR23589: std::function doesn't recognize null pointer to
varargs function.
r247036 Implementation of Boyer-Moore and Boyer-Moore-Horspool
searchers for the LFTS.
r249325 Implement LWG#2063, and update the issues links to point to the
github generated pages
r249738 Split <ctype.h> out of <cctype>.
r249739 Split <errno.h> out of <cerrno>.
r249740 Split <float.h> out of <cfloat>.
r249741 Split <inttypes.h> out of <cinttypes>.
r249742 Split <math.h> out of <cmath>.
r249743 Split <setjmp.h> out of <csetjmp>.
r249761 Split <stddef.h> out of <cstddef>.
r249798 Split <stdio.h> out of <cstdio>.
r249800 Split <stdlib.h> out of <cstdlib>.
r249889 Split <wchar.h> out of <cwchar>.
r249890 Split <wctype.h> out of <cwctype>.
r249929 Split <string.h> out of <cstring>.
r250254 ABI versioning macros for libc++.
r251246 Fix LWG#2244: basic_istream::seekg
r251247 Fix LWG#2127: Move-construction with raw_storage_iterator.
r251253 Fix LWG#2476: scoped_allocator_adaptor is not assignable
r251257 Fix LWG#2489: mem_fn() should be noexcept
r251618 Implement P0004R1 'Remove Deprecated iostreams aliases'
r251766 Implement the first part of P0006R0: Adopt Type Traits Variable
Templates for C++17.
r252195 Implement P0092R1 for C++1z
r252350 Allow deque to handle incomplete types.
r252406 More of P0006R0: type traits variable aliases for C++17.
r252407 Implement LWG#2353: std::next is over-constrained
r252905 Implement P0074: Making owner_less more flexible
r253215 Implement P0013R1: Logical Operator Type Traits.
r253274 Implement P0007: Constant View: A proposal for a std::as_const
helper function template.
r254119 Add static_assert to set/multiset/map/multimap/forward_list/deque
that the allocator's value_type match the container's value_type.
r254283 Implement more of P0006; Type Traits Variable Templates.
r255941 LWG2485: get() should be overloaded for const tuple&&.
r256325 Fix LWG Issue #2367 - Fixing std::tuple and std::pair's default
constructors.
r256652 Fix for ALL undefined behavior in <list>.
r256859 First half of LWG#2354: 'Unnecessary copying when inserting
into maps with braced-init syntax'

Exp-run: antoine
Relnotes: yes

Upgrade our copies of clang, llvm, lldb, compiler-rt and libc++ to 3.7.0
release.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.7.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.7.0/tools/clang/docs/ReleaseNotes.html>

Thanks to Ed Maste, Andrew Turner and Antoine Brodin for their help.

Exp-run: antoine
Relnotes: yes

Since contrib/libc++'s ancestry was never correct, subversion 1.8 and
higher cannot merge to it from the vendor area.

Re-bootstrap the ancestry by doing (apologies to your retinas):
* svn rm contrib/libc++
* svn cp ^/vendor/libc++/dist@276792 contrib/libc++
* svn cp ^/head/contrib/libc++/FREEBSD-upgrade@287629 contrib/libc++
* svn cp ^/head/contrib/libc++/include/__bit_reference@287629 contrib/libc++/include
* svn cp ^/head/contrib/libc++/include/__config@287629 contrib/libc++/include
* svn cp ^/head/contrib/libc++/include/__tree@287629 contrib/libc++/include
* svn cp ^/head/contrib/libc++/include/algorithm@287629 contrib/libc++/include
* svn cp ^/head/contrib/libc++/include/stdexcept@287629 contrib/libc++/include
* svn cp ^/head/contrib/libc++/include/type_traits@287629 contrib/libc++/include
* svn pd -R svn:mergeinfo contrib/libc++
* svn ps -F mergeinfo.txt contrib/libc++

Vendor import of libc++ trunk r224926:
https://llvm.org/svn/llvm-project/libcxx/trunk@224926

Vendor import of libc++ tags/RELEASE_34/final r197960:
https://llvm.org/svn/llvm-project/libcxx/tags/RELEASE_34/final@197960

Import new libc++ to vendor branch.

Pull new version of libc++ into vendor branch.

Vendor import of libc++ trunk r165949:
http://llvm.org/svn/llvm-project/libcxx/trunk@165949

Import a new version of libc++ into the vendor branch.

Import new version of libc++ into vendor branch.

Approved by: dim (mentor)

Import libcxxrt / libc++ into a vendor branch.

Approved by: dim (mentor)