[PATCH] [ARM64] Enable feature predicates for NEON / FP / CRYPTO.

[Kevin Qin]

Hi t.p.northover,

AArch64 has feature predicates for NEON and FP instructions. This allows the compiler to generate code without using NEON instructions.
This patch is to implement this. Please review, thanks.

http://reviews.llvm.org/D3396

Files:
  lib/Target/ARM64/ARM64CallingConvention.td
  lib/Target/ARM64/ARM64ISelLowering.cpp
  lib/Target/ARM64/ARM64InstrFormats.td
  lib/Target/ARM64/ARM64InstrInfo.cpp
  lib/Target/ARM64/ARM64InstrInfo.h
  lib/Target/ARM64/ARM64InstrInfo.td
  lib/Target/ARM64/ARM64TargetTransformInfo.cpp
  lib/Target/ARM64/AsmParser/ARM64AsmParser.cpp
  test/CodeGen/ARM64/complex-copy-noneon.ll
  test/CodeGen/ARM64/crypto.ll
  test/CodeGen/ARM64/reg-copy-noneon.ll
  test/MC/ARM64/advsimd.s
  test/MC/ARM64/aliases.s
  test/MC/ARM64/arithmetic-encoding.s
  test/MC/ARM64/crypto.s
  test/MC/ARM64/diagno-predicate.s
  test/MC/ARM64/fp-encoding.s
  test/MC/ARM64/nv-cond.s
  test/MC/ARM64/simd-ldst.s
  test/MC/ARM64/vector-lists.s
  test/MC/ARM64/verbose-vector-case.s
  test/MC/Disassembler/ARM64/advsimd.txt
  test/MC/Disassembler/ARM64/canonical-form.txt
  test/MC/Disassembler/ARM64/crypto.txt
  test/MC/Disassembler/ARM64/non-apple-fmov.txt
  test/MC/Disassembler/ARM64/scalar-fp.txt
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