Provide baseline for experimental GC implementation.

src/arm/macro-assembler-arm.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 317 matching lines @@
 }
 
 
 void MacroAssembler::StoreRoot(Register source,
                                Heap::RootListIndex index,
                                Condition cond) {
   str(source, MemOperand(roots, index << kPointerSizeLog2), cond);
 }
 
 
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
 void MacroAssembler::RecordWriteHelper(Register object,
                                        Register address,
                                        Register scratch) {
   if (FLAG_debug_code) {
     // Check that the object is not in new space.
     Label not_in_new_space;
     InNewSpace(object, scratch, ne, &not_in_new_space);
     Abort("new-space object passed to RecordWriteHelper");
     bind(&not_in_new_space);
   }
@@ skipping 83 matching lines @@
   bind(&done);
 
   // Clobber all input registers when running with the debug-code flag
   // turned on to provoke errors.
   if (FLAG_debug_code) {
     mov(object, Operand(BitCast<int32_t>(kZapValue)));
     mov(address, Operand(BitCast<int32_t>(kZapValue)));
     mov(scratch, Operand(BitCast<int32_t>(kZapValue)));
   }
 }
-
+#endif
 
 // Push and pop all registers that can hold pointers.
 void MacroAssembler::PushSafepointRegisters() {
   // Safepoints expect a block of contiguous register values starting with r0:
   ASSERT(((1 << kNumSafepointSavedRegisters) - 1) == kSafepointSavedRegisters);
   // Safepoints expect a block of kNumSafepointRegisters values on the
   // stack, so adjust the stack for unsaved registers.
   const int num_unsaved = kNumSafepointRegisters - kNumSafepointSavedRegisters;
   ASSERT(num_unsaved >= 0);
   sub(sp, sp, Operand(num_unsaved * kPointerSize));
@@ skipping 1655 matching lines @@
 
 void CodePatcher::Emit(Address addr) {
   masm()->emit(reinterpret_cast<Instr>(addr));
 }
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM