Matthias Braun ea4359e922 PeepholeOptimizer: Fix for vregs without defs ...

The PeepholeOptimizer would fail for vregs without a definition. If this
was caused by an undef operand abort to keep the code simple (so we
don't need to add logic everywhere to replicate the undef flag).

Differential Revision: https://reviews.llvm.org/D40763

llvm-svn: 322319

2018-01-11 22:30:43 +00:00

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