[heap] Minor MC: Add marking

src/heap/heap.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_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 654 matching lines @@
 
   static bool RootIsImmortalImmovable(int root_index);
 
   // Checks whether the space is valid.
   static bool IsValidAllocationSpace(AllocationSpace space);
 
   // Generated code can embed direct references to non-writable roots if
   // they are in new space.
   static bool RootCanBeWrittenAfterInitialization(RootListIndex root_index);
 
+  static bool IsUnmodifiedHeapObject(Object** p);
+
   // Zapping is needed for verify heap, and always done in debug builds.
   static inline bool ShouldZapGarbage() {
 #ifdef DEBUG
     return true;
 #else
 #ifdef VERIFY_HEAP
     return FLAG_verify_heap;
 #else
     return false;
 #endif
@@ skipping 94 matching lines @@
 
   // Used in CreateAllocationSiteStub and the (de)serializer.
   Object** allocation_sites_list_address() { return &allocation_sites_list_; }
 
   void set_encountered_weak_collections(Object* weak_collection) {
     encountered_weak_collections_ = weak_collection;
   }
   Object* encountered_weak_collections() const {
     return encountered_weak_collections_;
   }
+  void VisitEncounteredWeakCollections(ObjectVisitor* visitor) {
+    visitor->VisitPointer(&encountered_weak_collections_);
+  }
 
   void set_encountered_weak_cells(Object* weak_cell) {
     encountered_weak_cells_ = weak_cell;
   }
   Object* encountered_weak_cells() const { return encountered_weak_cells_; }
 
   void set_encountered_transition_arrays(Object* transition_array) {
     encountered_transition_arrays_ = transition_array;
   }
   Object* encountered_transition_arrays() const {
@@ skipping 1837 matching lines @@
   friend class LargeObjectSpace;
   friend class NewSpace;
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_