[PATCH] [msan] Poison the entire stack frame with one memset

[Evgeniy Stepanov]

Hi samsonov, kcc,

Fix current ineffective MSan function prologue by lumping all locals into a single alloca (a-la ASan, but without redzones) and poisoning it with a single memset call.

This sounds like it could share some code with ASan, but there are way too many little differencies between two tools, so I copied ASan implementation into MSan and greatly simplified it.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7670

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

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