[PATCH] Fix DebugInfo replaceAllUsesWith.

[Frederic Riss]

Hi dblaikie, echristo, aprantl,

replaceAllUsesWith had been modified to allow a DbgNode value to be
replaced by itself. In that case a new node is created by copying the
current DbgNode and the copy is used as replacement value.

When that copying happens, the value stored in this->DbgNode at the end
of RAUW would be a reference to the Node that has just been deleted.

This doesn't produce any bug right now, because the DI node on which we
call RAUW won't be used again.

http://reviews.llvm.org/D5326

Files:
  lib/IR/DebugInfo.cpp
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