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Commit 8de09aa0 authored by Matthias Braun's avatar Matthias Braun
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RegisterCoalescer: Need to check DstReg+SrcReg for missing undef flags 

copy coalescing with enabled subregister liveness can reveal undef uses,
previously this was only checked for the SrcReg in updateRegDefsUses()
but we need to check DstReg as well.

llvm-svn: 262767
parent 2cbfd9ff
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