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

src/heap/heap-inl.h

Index: src/heap/heap-inl.h
diff --git a/src/heap/heap-inl.h b/src/heap/heap-inl.h
index c3fa55aed9b2eacd2b28af34f905b101d9f38983..90d19280398d1d312d5ce9a6f9f1905fa62b38bd 100644
--- a/src/heap/heap-inl.h
+++ b/src/heap/heap-inl.h
@@ -502,9 +502,7 @@ void Heap::RecordWrite(Object* object, int offset, Object* o) {
   if (!InNewSpace(o) || !object->IsHeapObject() || InNewSpace(object)) {
     return;
   }
-  RememberedSet<OLD_TO_NEW>::Insert(
-      Page::FromAddress(reinterpret_cast<Address>(object)),
-      HeapObject::cast(object)->address() + offset);
+  store_buffer()->InsertEntry(HeapObject::cast(object)->address() + offset);
 }
 
 void Heap::RecordWriteIntoCode(Code* host, RelocInfo* rinfo, Object* value) {
@@ -515,11 +513,9 @@ void Heap::RecordWriteIntoCode(Code* host, RelocInfo* rinfo, Object* value) {
 
 void Heap::RecordFixedArrayElements(FixedArray* array, int offset, int length) {
   if (InNewSpace(array)) return;
-  Page* page = Page::FromAddress(reinterpret_cast<Address>(array));
   for (int i = 0; i < length; i++) {
     if (!InNewSpace(array->get(offset + i))) continue;
-    RememberedSet<OLD_TO_NEW>::Insert(
-        page,
+    store_buffer()->InsertEntry(
         reinterpret_cast<Address>(array->RawFieldOfElementAt(offset + i)));
   }
 }