- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

gcc: add some configuration and references.

-Add configure support for FreeBSD 10 and 11.
-Adapt a threading fix to gnu POSIX95 (which we don't use).
-Refer to a bug fix for the disabled vrptree support.

This is all useless in our current build but it is included
for convenience in case someone may want to re-package our
older gcc.

Reviewed by: gerald (long ago)

Correction to the log for rev. 1.4:
"One must now explicitly specify -ftree-vrp if one wants it".

Approved by: re(KenSmith)

Do not imply -ftree-vrp with -O2 and above. One must implicitly specify
'-ftree-vrp' if one wants it.
Some bad code generation has been tracked to -ftree-vrp. jdk1{5,6} are
notable examples.

Approved by: re(kensmith)

In FreeBSD -O0 -O1 optimize alignment for time, not size.

-O0 -O1 should optimize alignment for time, not size. Moved from toplev.c.

This commit was generated by cvs2svn to compensate for changes in r132718,
which included commits to RCS files with non-trunk default branches.

Gcc 3.4.2 20040728.