r322319 | matze | 2018-01-11 14:30:43 -0800 (Thu, 11 Jan 2018) | 7 lines
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).