R600/SI: Add instruction shrinking pass

This pass converts 64-bit instructions to 32-bit when possible.

llvm-svn: 213561
diff --git a/llvm/lib/Target/R600/AMDGPU.h b/llvm/lib/Target/R600/AMDGPU.h
index 416e050..d7e94f7 100644
--- a/llvm/lib/Target/R600/AMDGPU.h
+++ b/llvm/lib/Target/R600/AMDGPU.h
@@ -39,6 +39,7 @@
 FunctionPass *createSITypeRewriter();
 FunctionPass *createSIAnnotateControlFlowPass();
 FunctionPass *createSILowerI1CopiesPass();
+FunctionPass *createSIShrinkInstructionsPass();
 FunctionPass *createSILowerControlFlowPass(TargetMachine &tm);
 FunctionPass *createSIFixSGPRCopiesPass(TargetMachine &tm);
 FunctionPass *createSIFixSGPRLiveRangesPass();