[PATCH] R600/SI: Comparisons set vcc / scc

[Matt Arsenault]

  Use if, which apparently exists, to set EXEC or not. This depends on a bug fix in tablegen for the empty list in the 64 case where VCC is never set.

http://llvm-reviews.chandlerc.com/D2377

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2377?vs=6046&id=6947#toc

Files:
  lib/Target/R600/SIInstrInfo.td
  lib/Target/R600/SIInstructions.td
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