Support double allocations when folding allocation.

src/hydrogen-instructions.h

 // 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 5052 matching lines @@
 
  private:
   HType type_;
   Flags flags_;
   Handle<Map> known_initial_map_;
 };
 
 
 class HInnerAllocatedObject: public HTemplateInstruction<1> {
  public:
-  HInnerAllocatedObject(HValue* value, int offset, HType type = HType::Tagged())
+  HInnerAllocatedObject(HValue* value,
+                        int offset,
+                        HType type = HType::Tagged(),
+                        bool double_alignment = false)
       : offset_(offset),
-        type_(type) {
+        type_(type),
+        double_alignment_(double_alignment) {
     ASSERT(value->IsAllocate());
     SetOperandAt(0, value);
     set_representation(Representation::Tagged());
   }
 
   HValue* base_object() { return OperandAt(0); }
   int offset() { return offset_; }
 
   virtual Representation RequiredInputRepresentation(int index) {
     return Representation::Tagged();
   }
 
   virtual HType CalculateInferredType() { return type_; }
 
   virtual void PrintDataTo(StringStream* stream);
 
+  bool MustAllocateDoubleAligned() {
+    return double_alignment_;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(InnerAllocatedObject)
 
  private:
   int offset_;
   HType type_;
+  bool double_alignment_;
 };
 
 
 inline bool StoringValueNeedsWriteBarrier(HValue* value) {
   return !value->type().IsBoolean()
       && !value->type().IsSmi()
       && !(value->IsConstant() && HConstant::cast(value)->ImmortalImmovable());
 }
 
 
@@ skipping 1587 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_