Krzysztof Parzyszek 70f027022c Account for undef values from predecessors in extendSegmentsToUses ...

It is legal for a PHI node not to have a live value in a predecessor
as long as the end of the predecessor is jointly dominated by an undef
value.

llvm-svn: 335607

2018-06-26 14:37:16 +00:00

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