- 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

Fix ixp425 boot2 with ARM EABI:
- libkern is missing __aeabi_llsl, implement this by calling __ashldi3.
- Because of how the asm entry macros are defined the boot2 code
requires the unwind symbols to exist, include them in boot2.

Approved by: re (marius)

Add __aeabi_memset to libkern, implemented using memset, as clang may
generate calls to it.

Add END to ARM libkern assembly functions

Move the __aeabi_unwind_cpp_pr{0,1,2} functions to libkern so they can be
referenced in a non-debug kernel.

Add __aeabi_memcpy to libkern as clang may generate calls to it.

Add the required __aeabi_* functions the kernel uses when built for ARM EABI

Do not use __XSCALE__ to detect if clz is available, use _ARM_ARCH_5 instead.

MFC After: 3 days

/* -> /*- for copyright notices, minor format tweaks as necessary

Use the RET macro.

Implement ffs with clz for Xscale.
Idea taken from: NetBSD

Don't attempt to profile __udivsi3() and friends, as mcount() uses them.

Import libkern arm specific bits.