Merge ^/head r279893 through r279984.

Pull in r231965 from upstream compiler-rt trunk (by Jörg Sonnenberger):

Refactor float to integer conversion to share the same code.
80bit Intel/PPC long double is excluded due to lacking suppo

Pull in r231965 from upstream compiler-rt trunk (by Jörg Sonnenberger):

Refactor float to integer conversion to share the same code.
80bit Intel/PPC long double is excluded due to lacking support
for the abstraction. Consistently provide saturation logic.
Extend to long double on 128bit IEEE extended platforms.

Initial patch with test cases from GuanHong Liu.
Reviewed by Steve Canon.

Differential Revision: http://reviews.llvm.org/D2804

Pull in r232107 from upstream compiler-rt trunk (by Ed Maste):

Use signed int implementation for __fixint

Requested by: emaste

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Update compiler-rt to trunk r228651. This enables using Address
Sanitizer and Undefined Behavior Sanitizer with clang 3.6.0.

MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

With the update of compiler-rt we try to build a number of files that
don't build on some ARM platforms, provide symbols we already provide in
libc, or don't exist. Remove these from the build. Some

With the update of compiler-rt we try to build a number of files that
don't build on some ARM platforms, provide symbols we already provide in
libc, or don't exist. Remove these from the build. Some of these may
return later on specific targets.

Differential Revision: https://reviews.freebsd.org/D1468
Reviewed by: dim, imp

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Update compiler-rt to trunk r224034. This brings a number of new
builtins, and also the various sanitizers. Support for these will be
added in a later commit.

Merge from head@274682

Merge HEAD@r272944.

IFC @r272481

Sync to HEAD@r272516.

Reintegrate head@r272414

Sponsored by: The FreeBSD Foundation

Clean up detection of hard-float ABIs. As with big-endian in r272368 we
can check against arm*hf*.

Remove MK_ARM_EABI, the armeb issues have been fixed. The code to support
the oabi is still in the tree, but it is expected this will be removed
as developers work on surrounding code.

With this com

Remove MK_ARM_EABI, the armeb issues have been fixed. The code to support
the oabi is still in the tree, but it is expected this will be removed
as developers work on surrounding code.

With this commit the ARM EABI is the only supported supported ABI by
FreeBSD on ARMa 32-bit processors.

X-MFC after: never
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D876

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MFC @ r266724

An SVM update will follow this.

IFC @266473

Merge from head

Use src.opts.mk in preference to bsd.own.mk except where we need stuff
from the latter.

Merge head

IFC @264767

Merge head up to r263906.

Add a new ARM TARGET_ARCH, armv6hf. This is considered experimental.

This targets the existing ARMv6 and ARMv7 SoCs that contain a VFP unit.
This is an optional coprocessors may not be present in al

Add a new ARM TARGET_ARCH, armv6hf. This is considered experimental.

This targets the existing ARMv6 and ARMv7 SoCs that contain a VFP unit.
This is an optional coprocessors may not be present in all devices, however
it appears to be in all current SoCs we support.

armv6hf targets the VFP variant of the ARM EABI and our copy of gcc is too
old to support this. Because of this there are a number of WITH/WITHOUT
options that are unsupported and must be left as the default value. The
options and their required value are:
* WITH_ARM_EABI
* WITHOUT_GCC
* WITHOUT_GNUCXX

In addition, without an external toolchain, the following need to be left
as their default:
* WITH_CLANG
* WITH_CLANG_IS_CC

As there is a different method of passing float and double values to
functions the ABI is incompatible with existing armv6 binaries. To use
this a full rebuild of world is required. Because no floating point values
are passed into the kernel an armv6 kernel with VFP enabled will work with
an armv6hf userland and vice versa.

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Merge head r233826 through r256722.

IFC @256277

Approved by: ken (mentor)