Add write barrier helper for code patching and refactor stack check patching.

src/incremental-marking.cc

 // Copyright 2011 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 69 matching lines @@
 
 void IncrementalMarking::RecordWriteForEvacuationFromCode(HeapObject* obj,
                                                           Object** slot,
                                                           Isolate* isolate) {
   IncrementalMarking* marking = isolate->heap()->incremental_marking();
   ASSERT(marking->is_compacting_);
   marking->RecordWrite(obj, slot, *slot);
 }
 
 
+void IncrementalMarking::RecordCodeTargetPatch(Code* host,
+                                               Address pc,
+                                               HeapObject* value) {
+  if (IsMarking()) {
+    RelocInfo rinfo(pc, RelocInfo::CODE_TARGET, 0, host);
+    RecordWriteIntoCode(host, &rinfo, value);
+  }
+}
+
+
 void IncrementalMarking::RecordCodeTargetPatch(Address pc, HeapObject* value) {
   if (IsMarking()) {
     Code* host = heap_->isolate()->inner_pointer_to_code_cache()->
         GcSafeFindCodeForInnerPointer(pc);
     RelocInfo rinfo(pc, RelocInfo::CODE_TARGET, 0, host);
     RecordWriteIntoCode(host, &rinfo, value);
   }
 }
 
 
@@ skipping 709 matching lines @@
   bytes_rescanned_ = 0;
   allocation_marking_factor_ = kInitialAllocationMarkingFactor;
 }
 
 
 int64_t IncrementalMarking::SpaceLeftInOldSpace() {
   return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSize();
 }
 
 } }  // namespace v8::internal