Oilpan: Remove a visitor parameter from isHeapObjectAlive

Source/platform/heap/HeapAllocator.h

Index: Source/platform/heap/HeapAllocator.h
diff --git a/Source/platform/heap/HeapAllocator.h b/Source/platform/heap/HeapAllocator.h
index 45ce9f91ed55d922088972cffbd6a7f5f88b8999..98cecec54142f92cf3a7d37180c7d17f82cfed1e 100644
--- a/Source/platform/heap/HeapAllocator.h
+++ b/Source/platform/heap/HeapAllocator.h
@@ -119,6 +119,12 @@ public:
         return ThreadState::current()->isAllocationAllowed();
     }
 
+    template<typename T>
+    static bool isHeapObjectAlive(T* object)
+    {
+        return Heap::isHeapObjectAlive(object);
+    }
+
     template<typename VisitorDispatcher>
     static void markNoTracing(VisitorDispatcher visitor, const void* t) { visitor->markNoTracing(t); }