[PATCH] [ARM64/AArch64] Hook up CRC32 subtarget feature to the driver

[Bradley Smith]

Hi t.p.northover,

A subtarget feature for CRC32 instructions was recently added in the ARM64 backend, this patch hooks it up to the currently existing -mcrc/-mnocrc options such that it is usable as an optional extension from clang.

http://reviews.llvm.org/D3591

Files:
  lib/Basic/Targets.cpp
  lib/Driver/Tools.cpp
  test/Preprocessor/aarch64-target-features.c
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