Provide baseline for experimental GC implementation.

src/x64/macro-assembler-x64.cc

 // Copyright 2010 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 55 matching lines @@
 void MacroAssembler::CompareRoot(Register with, Heap::RootListIndex index) {
   cmpq(with, Operand(kRootRegister, index << kPointerSizeLog2));
 }
 
 
 void MacroAssembler::CompareRoot(Operand with, Heap::RootListIndex index) {
   LoadRoot(kScratchRegister, index);
   cmpq(with, kScratchRegister);
 }
 
-
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
 void MacroAssembler::RecordWriteHelper(Register object,
                                        Register addr,
                                        Register scratch) {
   if (FLAG_debug_code) {
     // Check that the object is not in new space.
     NearLabel not_in_new_space;
     InNewSpace(object, scratch, not_equal, &not_in_new_space);
     Abort("new-space object passed to RecordWriteHelper");
     bind(&not_in_new_space);
   }
@@ skipping 120 matching lines @@
   bind(&done);
 
   // Clobber all input registers when running with the debug-code flag
   // turned on to provoke errors.
   if (FLAG_debug_code) {
     movq(object, BitCast<int64_t>(kZapValue), RelocInfo::NONE);
     movq(scratch, BitCast<int64_t>(kZapValue), RelocInfo::NONE);
     movq(index, BitCast<int64_t>(kZapValue), RelocInfo::NONE);
   }
 }
+#endif
 
 void MacroAssembler::Assert(Condition cc, const char* msg) {
   if (FLAG_debug_code) Check(cc, msg);
 }
 
 
 void MacroAssembler::AssertFastElements(Register elements) {
   if (FLAG_debug_code) {
     NearLabel ok;
     CompareRoot(FieldOperand(elements, HeapObject::kMapOffset),
@@ skipping 2119 matching lines @@
   CPU::FlushICache(address_, size_);
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64