[heap] Assert that there's no recodred slot corresponding to unboxed double field.

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/context-slot-cache.h"
 #include "src/base/bits.h"
@@ skipping 5873 matching lines @@
   if (!InNewSpace(object)) {
     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);
     RememberedSet<OLD_TO_OLD>::Remove(page, slot_addr);
   }
 }
 
+bool Heap::HasRecordedSlot(HeapObject* object, Object** slot) {
+  if (InNewSpace(object)) {
+    return false;
+  }
+  Address slot_addr = reinterpret_cast<Address>(slot);
+  Page* page = Page::FromAddress(slot_addr);
+  DCHECK_EQ(page->owner()->identity(), OLD_SPACE);
+  store_buffer()->MoveAllEntriesToRememberedSet();
+  return RememberedSet<OLD_TO_NEW>::Contains(page, slot_addr) ||
+         RememberedSet<OLD_TO_OLD>::Contains(page, slot_addr);
+}
+
 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);
     RememberedSet<OLD_TO_OLD>::RemoveRange(page, start, end,
                                            SlotSet::FREE_EMPTY_BUCKETS);
   }
@@ skipping 563 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8