[PATCH] msan: Handle musttail calls

[Reid Kleckner]

Hi eugenis,

First, avoid calling setTailCall(false) on musttail calls.  The funciton
prototypes should be "congruent", so the shadow layout should be exactly
the same.

Second, avoid inserting instrumentation after a musttail call to
propagate the return value shadow.  We don't need to propagate the
result of a tail call, it should already be in the right place.

http://reviews.llvm.org/D4331

Files:
  include/llvm/IR/Instructions.h
  lib/IR/Instructions.cpp
  lib/Transforms/Instrumentation/MemorySanitizer.cpp
  lib/Transforms/Utils/InlineFunction.cpp
  test/Instrumentation/MemorySanitizer/msan_basic.ll
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