[PATCH] R600/SI: Fix unreachable on branch on constant.

[Matt Arsenault]

Run simplifycfg before to make sure these are all removed first.


http://reviews.llvm.org/D3365

Files:
  lib/Target/R600/AMDGPUTargetMachine.cpp
  test/CodeGen/R600/cf-empty-stack-assert.ll
  test/CodeGen/R600/cf-loop-on-constant.ll
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