Make whether or not a Code object should be created by masm explicit

src/x87/macro-assembler-x87.cc

Index: src/x87/macro-assembler-x87.cc
diff --git a/src/x87/macro-assembler-x87.cc b/src/x87/macro-assembler-x87.cc
index 4651f57847aac8cfb0877c9731007595d7b7bc6c..c7dff9fb281f5ac956dc5216a26315f288a49073 100644
--- a/src/x87/macro-assembler-x87.cc
+++ b/src/x87/macro-assembler-x87.cc
@@ -19,12 +19,12 @@ namespace internal {
 // -------------------------------------------------------------------------
 // MacroAssembler implementation.
 
-MacroAssembler::MacroAssembler(Isolate* arg_isolate, void* buffer, int size)
+MacroAssembler::MacroAssembler(Isolate* arg_isolate, void* buffer, int size,
+                               bool create_code_object)
     : Assembler(arg_isolate, buffer, size),
       generating_stub_(false),
       has_frame_(false) {
-  if (isolate() != NULL) {
-    // TODO(titzer): should we just use a null handle here instead?
+  if (create_code_object) {
     code_object_ =
         Handle<Object>::New(isolate()->heap()->undefined_value(), isolate());
   }
@@ -2663,7 +2663,7 @@ bool AreAliased(Register reg1,
 CodePatcher::CodePatcher(byte* address, int size)
     : address_(address),
       size_(size),
-      masm_(NULL, address, size + Assembler::kGap) {
+      masm_(NULL, address, size + Assembler::kGap, false) {
   // Create a new macro assembler pointing to the address of the code to patch.
   // The size is adjusted with kGap on order for the assembler to generate size
   // bytes of instructions without failing with buffer size constraints.