X64: Add fix of issue 392 to X64

src/x64/codegen-x64.cc

 // Copyright 2009 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 5537 matching lines @@
   ASSERT(!is_illegal());
   if (type_ != SLOT) {
     GetValue(typeof_state);
     return;
   }
 
   Slot* slot = expression_->AsVariableProxy()->AsVariable()->slot();
   ASSERT(slot != NULL);
   if (slot->type() == Slot::LOOKUP ||
       slot->type() == Slot::CONTEXT ||
-      slot->var()->mode() == Variable::CONST) {
+      slot->var()->mode() == Variable::CONST ||
+      slot->is_arguments()) {
     GetValue(typeof_state);
     return;
   }
 
   // Only non-constant, frame-allocated parameters and locals can reach
-  // here.
+  // here.  Be careful not to use the optimizations for arguments
+  // object access since it may not have been initialized yet.
+  ASSERT(!slot->is_arguments());
   if (slot->type() == Slot::PARAMETER) {
     cgen_->frame()->TakeParameterAt(slot->index());
   } else {
     ASSERT(slot->type() == Slot::LOCAL);
     cgen_->frame()->TakeLocalAt(slot->index());
   }
 }
 
 
 void Reference::SetValue(InitState init_state) {
@@ skipping 1646 matching lines @@
 int CompareStub::MinorKey() {
   // Encode the two parameters in a unique 16 bit value.
   ASSERT(static_cast<unsigned>(cc_) < (1 << 15));
   return (static_cast<unsigned>(cc_) << 1) | (strict_ ? 1 : 0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal