[PATCH] [mips] Don't emit redundant mask instructions if the mask is already present.

[Sasa Stankovic]

Hi mseaborn,

The situation where masks are already present can only happen for sandboxed inline assembly. Since PNaCl currently doesn't allow inline assembly, this patch is only useful for tests that contain inline assembly.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6718

Files:
  lib/Target/Mips/MCTargetDesc/MipsNaClELFStreamer.cpp

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