Provide baseline for experimental GC implementation.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index b5c0289174e7c94abf332dbc8a43726f9e8c47ce..4c1b9b5eda6a079c8c1d9535cb4ee83182256966 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -2335,20 +2335,24 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
   // Do the store.
   if (instr->is_in_object()) {
     __ mov(FieldOperand(object, offset), value);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
     if (instr->needs_write_barrier()) {
       Register temp = ToRegister(instr->temp());
       // Update the write barrier for the object for in-object properties.
       __ RecordWrite(object, offset, value, temp);
     }
+#endif
   } else {
     Register temp = ToRegister(instr->temp());
     __ mov(temp, FieldOperand(object, JSObject::kPropertiesOffset));
     __ mov(FieldOperand(temp, offset), value);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
     if (instr->needs_write_barrier()) {
       // Update the write barrier for the properties array.
       // object is used as a scratch register.
       __ RecordWrite(temp, offset, value, object);
     }
+#endif
   }
 }
 
@@ -2386,12 +2390,14 @@ void LCodeGen::DoStoreKeyedFastElement(LStoreKeyedFastElement* instr) {
            value);
   }
 
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   // Update the write barrier unless we're certain that we're storing a smi.
   if (instr->hydrogen()->NeedsWriteBarrier()) {
     // Compute address of modified element and store it into key register.
     __ lea(key, FieldOperand(elements, key, times_4, FixedArray::kHeaderSize));
     __ RecordWrite(elements, key, value);
   }
+#endif
 }