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When dead code elimination deletes a PHI value, the virtual register may split into multiple connected components. In that case, revert each component to the RS_Assign stage. The new components are guaranteed to be smaller (the original value numbers are distributed among the components), so this will always be making progress. The components are now allowed to evict other live ranges or be split again. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136034 91177308-0d34-0410-b5e6-96231b3b80d8
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