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When DCE clones a live range because it separates into connected components, make sure that the clones enter the same register allocator stage as the register they were cloned from. For instance, clones may be split even when they where created during spilling. Other registers created during spilling are not candidates for splitting or even (re-)spilling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128524 91177308-0d34-0410-b5e6-96231b3b80d8
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