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6d742cc61e
findLastUseBefore was previous considering virtreg liveness only, leading to incorrect live intervals for reg units when instrs with physreg operands were moved up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163685 91177308-0d34-0410-b5e6-96231b3b80d8
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