[PATCH] D43650: [ARM] Add ARMv8.2-A FP16 vector intrinsics

[Abderrazek Zaafrani via Phabricator via cfe-commits]

az created this revision.
az added a reviewer: SjoerdMeijer.
Herald added subscribers: kristof.beyls, javed.absar.

This patch adds the fp16 neon vector intrinsic for ARM as described in the ARM ACLE document.

While this patch may seem large at first but it is essentially a modification/addition on top of  some old work by doing this:

- Port AArch64 patch https://reviews.llvm.org/D32511 to ARM.
- Enable the frontend fp16 data type for ARM (which is a revert of patch  https://reviews.llvm.org/D41360).


https://reviews.llvm.org/D43650

Files:
  clang/include/clang/Basic/arm_neon.td
  clang/lib/Basic/Targets/ARM.cpp
  clang/lib/Basic/Targets/ARM.h
  clang/lib/CodeGen/CGBuiltin.cpp
  clang/lib/CodeGen/CodeGenFunction.h
  clang/test/CodeGen/arm-v8.2a-neon-intrinsics.c
  clang/test/CodeGen/arm_neon_intrinsics.c

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