Matt Arsenault 2209625387 AMDGPU: Preserve undef flag on vcc when shrinking v_cndmask_b32
The implicit operand is added by the initial instruction construction,
so this was adding an additional vcc use. The original one
was missing the undef flag the original condition had,
so the verifier would complain.

llvm-svn: 273182
2016-06-20 18:34:00 +00:00
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