Provide baseline for experimental GC implementation.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 6c51d6859c291f4d392f0695f05b0f18ac0f1bcc..3d0a1b374940556b3fbc9b6f62cda48d91682bc9 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -48,7 +48,7 @@ MacroAssembler::MacroAssembler(void* buffer, int size)
       code_object_(Heap::undefined_value()) {
 }
 
-
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
 void MacroAssembler::RecordWriteHelper(Register object,
                                        Register addr,
                                        Register scratch) {
@@ -181,7 +181,7 @@ void MacroAssembler::RecordWrite(Register object,
     mov(value, Immediate(BitCast<int32_t>(kZapValue)));
   }
 }
-
+#endif
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
 void MacroAssembler::DebugBreak() {