Perform TODO(gc) cleanup for TODO-lockdown.

src/x64/macro-assembler-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 466 matching lines @@
        reinterpret_cast<intptr_t>(Smi::FromInt(static_cast<int>(p1 - p0))),
        RelocInfo::NONE);
   push(kScratchRegister);
   CallRuntime(Runtime::kAbort, 2);
   // will not return here
   int3();
 }
 
 
 void MacroAssembler::CallStub(CodeStub* stub, unsigned ast_id) {
+  // TODO(1599): Do not call stubs from stubs that do not allow stub calls.
   // ASSERT(allow_stub_calls());  // calls are not allowed in some stubs
-  // TODO(gc): Fix this!
   Call(stub->GetCode(), RelocInfo::CODE_TARGET, ast_id);
 }
 
 
 MaybeObject* MacroAssembler::TryCallStub(CodeStub* stub) {
   ASSERT(allow_stub_calls());  // Calls are not allowed in some stubs.
   MaybeObject* result = stub->TryGetCode();
   if (!result->IsFailure()) {
     call(Handle<Code>(Code::cast(result->ToObjectUnchecked())),
          RelocInfo::CODE_TARGET);
@@ skipping 3524 matching lines @@
   movq(rcx, addr_reg);
   shrl(rcx, Immediate(kPointerSizeLog2));
   and_(rcx, Immediate((1 << Bitmap::kBitsPerCellLog2) - 1));
   movl(mask_reg, Immediate(1));
   shl_cl(mask_reg);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64