[PATCH] [AArch64 NEON] Accept both #0.0 and #0 for comparing with floating point zero in asm parser.

[Kevin Qin]

  Hi Tim,

  Sorry for updated late since last patch. We consider to let asm parser accept #0x0 as well. It means #0.0, #0 and #0x0 will be valid immediate for FCMXX. Also made some changes to simplify codes and get diagnostics more readable. Please review again, thanks.

http://llvm-reviews.chandlerc.com/D2432

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2432?vs=6157&id=6377#toc

Files:
  lib/Target/AArch64/AArch64InstrNEON.td
  lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
  test/MC/AArch64/neon-compare-instructions.s
  test/MC/AArch64/neon-diagnostics.s
  test/MC/AArch64/neon-scalar-fp-compare.s
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