Make backing store for incremental marking deque non-static.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index e9e777bba20467d5cc35f4f89e355f264829d503..77864cbe96cf3f4efcb9f8ff3c51fa075ad09519 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -35,6 +35,7 @@
 #include "incremental-marking.h"
 #include "list.h"
 #include "mark-compact.h"
+#include "objects-visiting.h"
 #include "spaces.h"
 #include "splay-tree-inl.h"
 #include "store-buffer.h"
@@ -292,6 +293,11 @@ class PromotionQueue {
 };
 
 
+typedef void (*ScavengingCallback)(Map* map,
+                                   HeapObject** slot,
+                                   HeapObject* object);
+
+
 // External strings table is a place where all external strings are
 // registered.  We need to keep track of such strings to properly
 // finalize them.
@@ -1321,6 +1327,10 @@ class Heap {
 
   inline bool OldGenerationAllocationLimitReached();
 
+  inline void DoScavengeObject(Map* map, HeapObject** slot, HeapObject* obj) {
+    scavenging_visitors_table_.GetVisitor(map)(map, slot, obj);
+  }
+
  private:
   Heap();
 
@@ -1535,8 +1545,6 @@ class Heap {
   // Allocate empty fixed array.
   MUST_USE_RESULT MaybeObject* AllocateEmptyFixedArray();
 
-  void SwitchScavengingVisitorsTableIfProfilingWasEnabled();
-
   // Performs a minor collection in new generation.
   void Scavenge();
 
@@ -1679,6 +1687,8 @@ class Heap {
 
   ExternalStringTable external_string_table_;
 
+  VisitorDispatchTable<ScavengingCallback> scavenging_visitors_table_;
+
   friend class Factory;
   friend class GCTracer;
   friend class DisallowAllocationFailure;