[heap] Pass a force_promotion flag to the evacuation routine in the scavenger.

src/heap/scavenger-inl.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_INL_H_
 #define V8_HEAP_SCAVENGER_INL_H_
 
 #include "src/heap/scavenger.h"
 
 namespace v8 {
 namespace internal {
 
-void Scavenger::ScavengeObject(HeapObject** p, HeapObject* object) {
+void Scavenger::ScavengeObject(HeapObject** p, HeapObject* object,
+                               bool force_promotion) {
   DCHECK(object->GetIsolate()->heap()->InFromSpace(object));
 
   // We use the first word (where the map pointer usually is) of a heap
   // object to record the forwarding pointer.  A forwarding pointer can
   // point to an old space, the code space, or the to space of the new
   // generation.
   MapWord first_word = object->map_word();
 
   // If the first word is a forwarding address, the object has already been
   // copied.
   if (first_word.IsForwardingAddress()) {
     HeapObject* dest = first_word.ToForwardingAddress();
     DCHECK(object->GetIsolate()->heap()->InFromSpace(*p));
     *p = dest;
     return;
   }
 
   object->GetHeap()->UpdateAllocationSite<Heap::kGlobal>(
       object, object->GetHeap()->global_pretenuring_feedback_);
 
   // AllocationMementos are unrooted and shouldn't survive a scavenge
   DCHECK(object->map() != object->GetHeap()->allocation_memento_map());
   // Call the slow part of scavenge object.
-  return ScavengeObjectSlow(p, object);
+  return ScavengeObjectSlow(p, object, force_promotion);
 }
 
 SlotCallbackResult Scavenger::CheckAndScavengeObject(Heap* heap,
-                                                     Address slot_address) {
+                                                     Address slot_address,
+                                                     bool force_promotion) {
   Object** slot = reinterpret_cast<Object**>(slot_address);
   Object* object = *slot;
   if (heap->InFromSpace(object)) {
     HeapObject* heap_object = reinterpret_cast<HeapObject*>(object);
     DCHECK(heap_object->IsHeapObject());
 
-    ScavengeObject(reinterpret_cast<HeapObject**>(slot), heap_object);
+    ScavengeObject(reinterpret_cast<HeapObject**>(slot), heap_object,
+                   force_promotion);
 
     object = *slot;
     // If the object was in from space before and is after executing the
     // callback in to space, the object is still live.
     // Unfortunately, we do not know about the slot. It could be in a
     // just freed free space object.
     if (heap->InToSpace(object)) {
       return KEEP_SLOT;
     }
   } else {
     DCHECK(!heap->InNewSpace(object));
   }
   return REMOVE_SLOT;
 }
 
 // static
 void StaticScavengeVisitor::VisitPointer(Heap* heap, HeapObject* obj,
                                          Object** p) {
   Object* object = *p;
   if (!heap->InNewSpace(object)) return;
   Scavenger::ScavengeObject(reinterpret_cast<HeapObject**>(p),
-                            reinterpret_cast<HeapObject*>(object));
+                            reinterpret_cast<HeapObject*>(object), false);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_SCAVENGER_INL_H_