[PATCH] R600: Make cttz / ctlz cheap to speculate

[Matt Arsenault]

Speculating things is generally good. SI+ has instructions for these
for 32-bit values. This is still probably better even with the expansion
for 64-bit values, although it is odd that this callback doesn't have
the size as a parameter.

http://reviews.llvm.org/D6826

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  lib/Target/R600/AMDGPUISelLowering.h
  test/CodeGen/R600/cttz-ctlz.ll

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