Replace slots buffer with remembered set.

src/heap/incremental-marking-inl.h

Index: src/heap/incremental-marking-inl.h
diff --git a/src/heap/incremental-marking-inl.h b/src/heap/incremental-marking-inl.h
index 0d55b83a9d552456c5dbd15f71455c653f3ef920..fa22da6d41ecebc06a5f9918c8041e8c10f418dd 100644
--- a/src/heap/incremental-marking-inl.h
+++ b/src/heap/incremental-marking-inl.h
@@ -26,11 +26,10 @@ void IncrementalMarking::RecordWriteOfCodeEntry(JSFunction* host, Object** slot,
   }
 }
 
-
-void IncrementalMarking::RecordWriteIntoCode(HeapObject* obj, RelocInfo* rinfo,
+void IncrementalMarking::RecordWriteIntoCode(Code* host, RelocInfo* rinfo,
                                              Object* value) {
   if (IsMarking() && value->IsHeapObject()) {
-    RecordWriteIntoCodeSlow(obj, rinfo, value);
+    RecordWriteIntoCodeSlow(host, rinfo, value);
   }
 }