[PATCH] Fix UBSan error reports in ValueMapCallbackVH and AssertingVH<T> empty/tombstone keys generation.

[Alexey Samsonov]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6903

Files:
  llvm/trunk/include/llvm/IR/ValueHandle.h
  llvm/trunk/include/llvm/IR/ValueMap.h

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