[PATCH] [ARM] Add CRC32 instructions and intrinsics for AArch32.

[Bradley Smith]

Add CRC32 instruction/intrinsic support in ARM/Thumb backend for use in v8 architectures.

http://llvm-reviews.chandlerc.com/D1672

Files:
  include/llvm/IR/IntrinsicsARM.td
  lib/Target/ARM/ARMInstrInfo.td
  lib/Target/ARM/ARMInstrThumb2.td
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  test/MC/ARM/crc32-thumb.s
  test/MC/ARM/crc32.s
  test/MC/ARM/invalid-crc32.s
  test/MC/Disassembler/ARM/crc32-thumb.txt
  test/MC/Disassembler/ARM/crc32.txt
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