PNaCl translator: combine insertelement / extractelement patterns generated by the toolchain into s…

lib/Transforms/NaCl/ExpandShuffleVector.cpp

 //===- ExpandShuffleVector.cpp - shufflevector to {insert/extract}element -===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Replace all shufflevector instructions by insertelement /
-// extractelement. InstCombine should be able to reconstruct the
-// shufflevector,
+// extractelement. CombineVectorInstructions is able to reconstruct the
+// shufflevector.
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Type.h"
@@ skipping 76 matching lines @@
 
   for (Instructions::iterator S = Shufs.begin(), E = Shufs.end(); S != E; ++S)
     Expand(*S, Int32);
 
   return !Shufs.empty();
 }
 
 BasicBlockPass *llvm::createExpandShuffleVectorPass() {
   return new ExpandShuffleVector();
 }