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

src/heap/scavenger.h

Index: src/heap/scavenger.h
diff --git a/src/heap/scavenger.h b/src/heap/scavenger.h
index 54fe6ffdf92f50b4a017bd4216b0005011b542a6..3db2e5d470f797a759bec2ccca7a40868f4a119c 100644
--- a/src/heap/scavenger.h
+++ b/src/heap/scavenger.h
@@ -12,7 +12,8 @@ namespace v8 {
 namespace internal {
 
 typedef void (*ScavengingCallback)(Map* map, HeapObject** slot,
-                                   HeapObject* object);
+                                   HeapObject* object,
+                                   PromotionMode promotion_mode);
 
 class Scavenger {
  public:
@@ -25,12 +26,15 @@ class Scavenger {
   // 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);
-  static inline SlotCallbackResult CheckAndScavengeObject(Heap* heap,
-                                                          Address slot_address);
+  static inline void ScavengeObject(
+      HeapObject** p, HeapObject* object,
+      PromotionMode promotion_mode = DEFAULT_PROMOTION);
+  static inline SlotCallbackResult CheckAndScavengeObject(
+      Heap* heap, Address slot_address, PromotionMode promotion_mode);
 
   // Slow part of {ScavengeObject} above.
-  static void ScavengeObjectSlow(HeapObject** p, HeapObject* object);
+  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).