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6d309059a7
We don't want unused values forming their own equivalence classes, so we lump them all together in one class, and then merge them with the class of the last used value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117670 91177308-0d34-0410-b5e6-96231b3b80d8