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