Generate TypedArrayInitialize builtin in hydrogen.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index c77c2ebf0e495a134172b2da370b19eebfdfb6cc..f6e95e8895e4b8cb5932435e335a0c006223bc61 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -4748,15 +4748,17 @@ class HRandom V8_FINAL : public HTemplateInstruction<1> {
 
 class HAdd V8_FINAL : public HArithmeticBinaryOperation {
  public:
-  static HInstruction* New(Zone* zone,
-                           HValue* context,
-                           HValue* left,
-                           HValue* right);
+  static HInstruction* New(

[danno, 2013/11/20 13:50:50]

nit: remove this whitespace change.

[Dmitry Lomov (no reviews), 2013/11/20 17:38:56]

Done.

+     Zone* zone,
+     HValue* context,
+     HValue* left,
+     HValue* right);
 
   // Add is only commutative if two integer values are added and not if two
   // tagged values are added (because it might be a String concatenation).
+  // We also do not commute (pointer + offset).
   virtual bool IsCommutative() const V8_OVERRIDE {
-    return !representation().IsTagged();
+    return !representation().IsTagged() && !representation().IsExternal();
   }
 
   virtual HValue* EnsureAndPropagateNotMinusZero(
@@ -4792,6 +4794,10 @@ class HAdd V8_FINAL : public HArithmeticBinaryOperation {
     }
   }
 
+  virtual Representation RepresentationFromInputs() V8_OVERRIDE;
+
+  virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE;
+
   DECLARE_CONCRETE_INSTRUCTION(Add)
 
  protected:
@@ -6509,6 +6515,8 @@ class HStoreNamedField V8_FINAL : public HTemplateInstruction<3> {
       } else if (field_representation().IsDouble() ||
                  field_representation().IsSmi()) {
         return field_representation();
+      } else if (field_representation().IsExternal()) {
+        return Representation::External();
       }
     }
     return Representation::Tagged();