[PATCH] R600/SI: Set HasMultipleConditionRegisters

[Matt Arsenault]

This is true if we are using vector conditions. For now,
we are always doing this. Until there is a useful way of
getting uniformity information at this point and we attempt
to use scalar compares, it is better to assume that we can
use any SGPR pair for conditions.

http://reviews.llvm.org/D9419

Files:
  lib/Target/R600/SIISelLowering.cpp
  test/CodeGen/R600/select-opt.ll

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