Perform TODO(gc) cleanup for TODO-lockdown.

src/x64/code-stubs-x64.cc

 // Copyright 2011 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 5476 matching lines @@
   __ Move(address, regs_.address());
   __ Move(arg1, regs_.object());
   if (mode == INCREMENTAL_COMPACTION) {
     // TODO(gc) Can we just set address arg2 in the beginning?
     __ Move(arg2, address);
   } else {
     ASSERT(mode == INCREMENTAL);
     __ movq(arg2, Operand(address, 0));
   }
   __ LoadAddress(arg3, ExternalReference::isolate_address());
-  // TODO(gc): Create a fast version of this C function that does not duplicate
-  // the checks done in the stub.
   int argument_count = 3;
   __ PrepareCallCFunction(argument_count);
   if (mode == INCREMENTAL_COMPACTION) {
     __ CallCFunction(
         ExternalReference::incremental_evacuation_record_write_function(
             masm->isolate()),
         argument_count);
   } else {
     ASSERT(mode == INCREMENTAL);
     __ CallCFunction(
@@ skipping 32 matching lines @@
   // TODO(gc): Add call to EnsureNotWhite here.
   // Fall through when we need to inform the incremental marker.
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64