[PATCH] Fix a couple of use-after-frees in X86ISelDAGToDAG

[Justin Bogner via llvm-commits]

While looking at llvm.org/PR26808 I found a couple of use-after-frees in
X86ISelDAGToDAG, where we RAUW a node and then try to keep using it. The
attached patch fixes the tests that crash under ASan, but it feels a bit
targetted and kludgy. I'm afraid a robust fix would involve a lot of
refactoring of how X86ISelDAGToDAG works though, and I certainly won't
be able to do that any time soon.

Thoughts?

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