Replace slots buffer with remembered set.

src/heap/incremental-marking.cc

Index: src/heap/incremental-marking.cc
diff --git a/src/heap/incremental-marking.cc b/src/heap/incremental-marking.cc
index ce6f6ee69b014affc541a4d0f47a983295a28e9c..924b94e1087686f446d654bd8719541b13f58ec4 100644
--- a/src/heap/incremental-marking.cc
+++ b/src/heap/incremental-marking.cc
@@ -131,13 +131,11 @@ void IncrementalMarking::RecordWriteOfCodeEntrySlow(JSFunction* host,
   }
 }
 
-
-void IncrementalMarking::RecordWriteIntoCodeSlow(HeapObject* obj,
-                                                 RelocInfo* rinfo,
+void IncrementalMarking::RecordWriteIntoCodeSlow(Code* host, RelocInfo* rinfo,
                                                  Object* value) {
-  if (BaseRecordWrite(obj, value)) {
-      // Object is not going to be rescanned.  We need to record the slot.
-      heap_->mark_compact_collector()->RecordRelocSlot(rinfo, value);
+  if (BaseRecordWrite(host, value)) {
+    // Object is not going to be rescanned.  We need to record the slot.
+    heap_->mark_compact_collector()->RecordRelocSlot(host, rinfo, value);
   }
 }