[heap] Use store buffer for writes coming from mutator.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 5ee2d975a23ea2de9254ccd5e747f211971b4de2..5e9547f4785bd7e1a828aae3a764427684999459 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -5885,8 +5885,7 @@ void Heap::ClearRecordedSlot(HeapObject* object, Object** slot) {
     Address slot_addr = reinterpret_cast<Address>(slot);
     Page* page = Page::FromAddress(slot_addr);
     DCHECK_EQ(page->owner()->identity(), OLD_SPACE);
-    store_buffer()->MoveAllEntriesToRememberedSet();
-    RememberedSet<OLD_TO_NEW>::Remove(page, slot_addr);
+    store_buffer()->DeleteEntry(slot_addr);
     RememberedSet<OLD_TO_OLD>::Remove(page, slot_addr);
   }
 }
@@ -5895,9 +5894,7 @@ void Heap::ClearRecordedSlotRange(Address start, Address end) {
   Page* page = Page::FromAddress(start);
   if (!page->InNewSpace()) {
     DCHECK_EQ(page->owner()->identity(), OLD_SPACE);
-    store_buffer()->MoveAllEntriesToRememberedSet();
-    RememberedSet<OLD_TO_NEW>::RemoveRange(page, start, end,
-                                           SlotSet::PREFREE_EMPTY_BUCKETS);
+    store_buffer()->DeleteEntry(start, end);
     RememberedSet<OLD_TO_OLD>::RemoveRange(page, start, end,
                                            SlotSet::FREE_EMPTY_BUCKETS);
   }