[PATCH] Prevent MDNode's RAUW from introducing a reference to a void Value.

[Frederic Riss]

New try to fix this issue with a different stategy: add an assert to enforce
that ValueHandleBase::ValueIsRAUWd isn't called with a new value that hasn't
the same type as the old one. Fix InstCombine to not violate the invariant.

How does that look?

http://reviews.llvm.org/D5828

Files:
  lib/IR/Value.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/DebugInfo/voidMDNode.ll
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