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Commit 2b3a4e78 authored by Quentin Colombet's avatar Quentin Colombet
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[X86] Teach the expansion of copy instructions how to do proper liveness. 

When the simple analysis provided by MachineBasicBlock::computeRegisterLiveness
fails, fall back on the LivePhysReg utility.

llvm-svn: 267623
parent 08e79990
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