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With physreg joining out of the way, it is easy to recognize the instructions that need their kill flags cleared while testing for interference. This allows us to skip the final scan of all instructions for an 11% speedup of the coalescer pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157169 91177308-0d34-0410-b5e6-96231b3b80d8
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