Immediatelly promote marked objects

src/heap/scavenger.h

 // Copyright 2015 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_SCAVENGER_H_
 #define V8_HEAP_SCAVENGER_H_
 
 #include "src/heap/objects-visiting.h"
 #include "src/heap/slot-set.h"
 
 namespace v8 {
 namespace internal {
 
 typedef void (*ScavengingCallback)(Map* map, HeapObject** slot,
                                    HeapObject* object,
                                    PromotionMode promotion_mode);
 
 class Scavenger {
  public:
   explicit Scavenger(Heap* heap) : heap_(heap) {}
 
   // Initializes static visitor dispatch tables.
   static void Initialize();
 
   // Callback function passed to Heap::Iterate etc.  Copies an object if
   // necessary, the object might be promoted to an old space.  The caller must
   // ensure the precondition that the object is (a) a heap object and (b) in
   // the heap's from space.
-  static inline void ScavengeObject(
-      HeapObject** p, HeapObject* object,
-      PromotionMode promotion_mode = DEFAULT_PROMOTION);
+  static inline void ScavengeObject(HeapObject** p, HeapObject* object,
+                                    PromotionMode promotion_mode);
   static inline SlotCallbackResult CheckAndScavengeObject(
       Heap* heap, Address slot_address, PromotionMode promotion_mode);
 
   // Slow part of {ScavengeObject} above.
   static void ScavengeObjectSlow(HeapObject** p, HeapObject* object,
                                  PromotionMode promotion_mode);
 
   // Chooses an appropriate static visitor table depending on the current state
   // of the heap (i.e. incremental marking, logging and profiling).
   void SelectScavengingVisitorsTable();
@@ skipping 28 matching lines @@
 class StaticScavengeVisitor
     : public StaticNewSpaceVisitor<StaticScavengeVisitor> {
  public:
   static inline void VisitPointer(Heap* heap, HeapObject* object, Object** p);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_SCAVENGER_H_