[heap] Ensure finalization of incremental marking even if all allocations

src/heap/incremental-marking.h

 // 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.
 
 #ifndef V8_HEAP_INCREMENTAL_MARKING_H_
 #define V8_HEAP_INCREMENTAL_MARKING_H_
 
 #include "src/cancelable-task.h"
 #include "src/execution.h"
 #include "src/heap/heap.h"
@@ skipping 48 matching lines @@
   INLINE(bool IsMarking()) { return state() >= MARKING; }
 
   inline bool IsMarkingIncomplete() { return state() == MARKING; }
 
   inline bool IsComplete() { return state() == COMPLETE; }
 
   inline bool IsReadyToOverApproximateWeakClosure() const {
     return request_type_ == FINALIZATION && !finalize_marking_completed_;
   }
 
+  inline bool NeedsFinalization() {
+    return IsMarking() &&
+           (request_type_ == FINALIZATION || request_type_ == COMPLETE_MARKING);
+  }
+
   GCRequestType request_type() const { return request_type_; }
 
   void reset_request_type() { request_type_ = NONE; }
 
   bool CanBeActivated();
 
   bool WasActivated();
 
   void Start(GarbageCollectionReason gc_reason);
 
@@ skipping 220 matching lines @@
   IncrementalMarkingJob incremental_marking_job_;
   Observer new_generation_observer_;
   Observer old_generation_observer_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(IncrementalMarking);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_INCREMENTAL_MARKING_H_