PNaCl: Add a vector type legalization pass.

lib/Transforms/NaCl/PNaClABISimplify.cpp

 //===-- PNaClABISimplify.cpp - Lists PNaCl ABI simplification passes ------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the meta-passes "-pnacl-abi-simplify-preopt"
@@ skipping 105 matching lines @@
   if (!isEmscripten) // JSBackend can handle external_weak.
     PM.add(createGlobalCleanupPass());
 
   if (EnableEmAsyncify)
     PM.add(createLowerEmAsyncifyPass());
 }
 
 void llvm::PNaClABISimplifyAddPostOptPasses(Triple *T, PassManagerBase &PM) {
   bool isEmscripten = T->isOSEmscripten();
 
+  PM.add(createPNaClVectorCanonicalizationPass());
+
   if (!isEmscripten) // setjmp/longjmp are handled in LowerEmSetjmp,
                      // memcpy/memmove/memset are handled in JSBackend.
     PM.add(createRewritePNaClLibraryCallsPass());
 
   // ExpandStructRegs must be run after ExpandArithWithOverflow to expand out
   // the insertvalue instructions that ExpandArithWithOverflow introduces.
   PM.add(createExpandArithWithOverflowPass());
 
   // We place ExpandByVal after optimization passes because some byval
   // arguments can be expanded away by the ArgPromotion pass.  Leaving
@@ skipping 97 matching lines @@
   if (!isEmscripten) // Dead prototypes ignored by JSBackend.
     PM.add(createStripDeadPrototypesPass());
 
   // Eliminate simple dead code that the post-opt passes could have created.
   PM.add(createDeadCodeEliminationPass());
 
   // This should be the last step before PNaCl ABI validation.
   if (!isEmscripten)
     PM.add(createCleanupUsedGlobalsMetadataPass());
 }