Disable dead code elimination of arguments object

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 3360 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(ArgumentsObject)
 
  private:
   HArgumentsObject(int count, Zone* zone)
       : HDematerializedObject(count, zone) {
     set_representation(Representation::Tagged());
     SetFlag(kIsArguments);
   }
 
-  virtual bool IsDeletable() const V8_FINAL V8_OVERRIDE { return true; }
+  virtual bool IsDeletable() const V8_FINAL V8_OVERRIDE { return false; }

[Michael Starzinger, 2014/04/07 07:46:24]

nit: This is the default implementation in HValue, no need to override it, let's
just drop the override.

[Jarin, 2014/04/07 08:40:59]

Done.

 };
 
 
 class HCapturedObject V8_FINAL : public HDematerializedObject {
  public:
   HCapturedObject(int length, int id, Zone* zone)
       : HDematerializedObject(length, zone), capture_id_(id) {
     set_representation(Representation::Tagged());
     values_.AddBlock(NULL, length, zone);  // Resize list.
   }
@@ skipping 4127 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_