Generate TypedArrayInitialize builtin in hydrogen.

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1244 matching lines @@
   }
   // Optimize double negation, a common pattern used for ToInt32(x).
   HValue* arg;
   if (MatchDoubleNegation(this, &arg) && !arg->CheckFlag(kUint32)) {
     return arg;
   }
   return this;
 }
 
 
+Representation HAdd::RepresentationFromInputs() {
+  Representation left_rep = left()->representation();
+  if (left_rep.IsExternal()) {
+    return Representation::External();
+  }
+  return HArithmeticBinaryOperation::RepresentationFromInputs();
+}
+
+
+Representation HAdd::RequiredInputRepresentation(int index) {
+  if (index == 2) {
+    Representation left_rep = left()->representation();
+    if (left_rep.IsExternal()) {
+      return Representation::Integer32();
+    }
+  }
+  return HArithmeticBinaryOperation::RequiredInputRepresentation(index);
+}
+
+
 static bool IsIdentityOperation(HValue* arg1, HValue* arg2, int32_t identity) {
   return arg1->representation().IsSpecialization() &&
     arg2->EqualsInteger32Constant(identity);
 }
 
 
 HValue* HAdd::Canonicalize() {
   // Adding 0 is an identity operation except in case of -0: -0 + 0 = +0
   if (IsIdentityOperation(left(), right(), 0) &&
       !left()->representation().IsDouble()) {  // Left could be -0.
@@ skipping 3099 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal