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a363a9b71a
defs or uses. The regular def and use checking below covers them, and can be more precise. It's safe to hoist an instruction with a dead implicit def if the register isn't live into the loop header. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97352 91177308-0d34-0410-b5e6-96231b3b80d8
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