Hydrogen stubs for array constructors

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 4930 matching lines @@
 
   HAllocate(HValue* context, HValue* size, HType type, Flags flags)
       : type_(type),
         flags_(flags) {
     SetOperandAt(0, context);
     SetOperandAt(1, size);
     set_representation(Representation::Tagged());
     SetGVNFlag(kChangesNewSpacePromotion);
   }
 
+  static Flags DefaultFlags() {
+    return CAN_ALLOCATE_IN_NEW_SPACE;
+  }
+
+  static Flags DefaultFlags(ElementsKind kind) {
+    Flags flags = CAN_ALLOCATE_IN_NEW_SPACE;
+    if (IsFastDoubleElementsKind(kind)) {
+      flags = static_cast<HAllocate::Flags>(
+          flags | HAllocate::ALLOCATE_DOUBLE_ALIGNED);
+    }
+    return flags;
+  }
+
   HValue* context() { return OperandAt(0); }
   HValue* size() { return OperandAt(1); }
 
   virtual Representation RequiredInputRepresentation(int index) {
     if (index == 0) {
       return Representation::Tagged();
     } else {
       return Representation::Integer32();
     }
   }
@@ skipping 1583 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_