Fix a bug in SelectionDAG's ReplaceAllUsesWith in the case where CSE and recursive RAUW calls delete a node from the use list, invalidating the use list iterator. There's currently no known way to reproduce this in an unmodified LLVM, however there's no fundamental reason why a SelectionDAG couldn't be formed which would trigger this case.
Fix a bug in SelectionDAG's ReplaceAllUsesWith in the case where
CSE and recursive RAUW calls delete a node from the use list,
invalidating the use list iterator. There's currently no known
way to reproduce this in an unmodified LLVM, however there's no
fundamental reason why a SelectionDAG couldn't be formed which
would trigger this case.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@97665 91177308-0d34-0410-b5e6-96231b3b80d8

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