Chris Lattner 8b8749f367 Fix a bug in RemoveDeadNodes where it would crash when its "optional"
argument is not specified.

Implement ReplaceAllUsesWith.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22834 91177308-0d34-0410-b5e6-96231b3b80d8
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