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It is fine for subregister ranges to be undefined on some CFG paths as we may have a "vregX:other_subreg<read-undef> =" def on that path. We do not (and should not) have live segments for the subregister ranges. The MachineVerifier should not complain about this. This is a slight variant of http://llvm.org/PR27705 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270290 91177308-0d34-0410-b5e6-96231b3b80d8
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