[PATCH] Allow __fp16 as a function arg or return type for AArch64

[Oliver Stannard]

ACLE 2.0 [1] allows __fp16 to be used as a function argument or return type. This enables this for AArch64.

I have not enabled this for 32-bit ARM targets yet, as we are expecting to release an updated version of the 32-bit AAPCS soon, which changes the handling of __fp16 in a non backwards-compatible way.

This also fixes an existing bug that causes clang to not allow homogeneous floating-point aggregates with a base type of __fp16. This is valid for AAPCS64, but not for AAPCS-VFP.

[1] http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf

http://reviews.llvm.org/D4456

Files:
  include/clang/Basic/LangOptions.def
  include/clang/Driver/CC1Options.td
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CGExprScalar.cpp
  lib/CodeGen/CodeGenTypes.cpp
  lib/CodeGen/CodeGenTypes.h
  lib/CodeGen/TargetInfo.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Sema/SemaType.cpp
  test/CodeGen/arm64-aapcs-arguments.c
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