[PATCH] Fix ubsan error in ValueMap

[Matt Arsenault]

Hi rsmith,

Fixes "llvm/IR/ValueMap.h:210:65: runtime error: upcast of misaligned address 0xfffffffffffffffc for type 'llvm::AllocaInst', which requires 8 byte alignment
0xfffffffffffffffc: note: pointer points here"

http://reviews.llvm.org/D6155

Files:
  include/llvm/IR/ValueMap.h
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