[PATCH] [msan] Instrument x86.*_cvt* intrinsics.

[Evgeniy Stepanov]

Hi kcc, dvyukov,

Currently MSan checks that arguments of *cvt* intrinsics are fully initialized. That's too much to ask: some of them only operate on lower half, or even quarter, of the input register.


http://llvm-reviews.chandlerc.com/D1898

Files:
  lib/Transforms/Instrumentation/MemorySanitizer.cpp
  test/Instrumentation/MemorySanitizer/vector_cvt.ll
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