Oilpan: Introduce WeakProcessingVisitor

Source/platform/heap/MarkingVisitorImpl.h

Index: Source/platform/heap/MarkingVisitorImpl.h
diff --git a/Source/platform/heap/MarkingVisitorImpl.h b/Source/platform/heap/MarkingVisitorImpl.h
index dd869fed5ffac1399cac675e10ead12144aa6f41..55bcf4c566a2240816748f8d7078155295e95cfb 100644
--- a/Source/platform/heap/MarkingVisitorImpl.h
+++ b/Source/platform/heap/MarkingVisitorImpl.h
@@ -41,6 +41,7 @@ protected:
 #if ENABLE(ASSERT)
         toDerived()->checkMarkingAllowed();
         ASSERT(Heap::findPageFromAddress(header));
+        ASSERT(toDerived()->markingMode() != Visitor::WeakProcessing);
 #endif
         header->mark();
 
@@ -62,16 +63,19 @@ protected:
 
     inline void registerDelayedMarkNoTracing(const void* objectPointer)
     {
+        ASSERT(toDerived()->markingMode() != Visitor::WeakProcessing);
         Heap::pushPostMarkingCallback(const_cast<void*>(objectPointer), &markNoTracingCallback);
     }
 
     inline void registerWeakMembers(const void* closure, const void* objectPointer, WeakCallback callback)
     {
+        ASSERT(toDerived()->markingMode() != Visitor::WeakProcessing);
         Heap::pushThreadLocalWeakCallback(const_cast<void*>(closure), const_cast<void*>(objectPointer), callback);
     }
 
     inline void registerWeakTable(const void* closure, EphemeronCallback iterationCallback, EphemeronCallback iterationDoneCallback)
     {
+        ASSERT(toDerived()->markingMode() != Visitor::WeakProcessing);
         Heap::registerWeakTable(const_cast<void*>(closure), iterationCallback, iterationDoneCallback);
     }
 
@@ -112,6 +116,7 @@ protected:
 protected:
     inline void registerWeakCellWithCallback(void** cell, WeakCallback callback)
     {
+        ASSERT(toDerived()->markingMode() != Visitor::WeakProcessing);
         Heap::pushGlobalWeakCallback(cell, callback);
     }