Make HToFastProperties GC safe.

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 6532 matching lines @@
   DECLARE_INSTRUCTION_FACTORY_P1(HToFastProperties, HValue*);
 
   virtual Representation RequiredInputRepresentation(int index) {
     return Representation::Tagged();
   }
 
   DECLARE_CONCRETE_INSTRUCTION(ToFastProperties)
 
  private:
   explicit HToFastProperties(HValue* value) : HUnaryOperation(value) {
-    // This instruction is not marked as having side effects, but
-    // changes the map of the input operand. Use it only when creating
+    set_representation(Representation::Tagged());
+    SetGVNFlag(kChangesNewSpacePromotion);
+
+    // This instruction is not marked as kChangesMaps, but does
+    // change the map of the input operand. Use it only when creating
     // object literals via a runtime call.
     ASSERT(value->IsCallRuntime());
 #ifdef DEBUG
     const Runtime::Function* function = HCallRuntime::cast(value)->function();
     ASSERT(function->function_id == Runtime::kCreateObjectLiteral ||
            function->function_id == Runtime::kCreateObjectLiteralShallow);
 #endif
-    set_representation(Representation::Tagged());
   }
 
   virtual bool IsDeletable() const { return true; }
 };
 
 
 class HValueOf: public HUnaryOperation {
  public:
   explicit HValueOf(HValue* value) : HUnaryOperation(value) {
     set_representation(Representation::Tagged());
@@ skipping 200 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_