Generalize AllocationMemento::FindForHeapObject and remove corresponding new space check.

src/heap-inl.h

Index: src/heap-inl.h
diff --git a/src/heap-inl.h b/src/heap-inl.h
index 525c634da626809c7c1bdfa3ce70b512e8eca621..d3c5b6fc022fa63fa31383a2d5c6078f0931bffa 100644
--- a/src/heap-inl.h
+++ b/src/heap-inl.h
@@ -485,8 +485,8 @@ void Heap::ScavengePointer(HeapObject** p) {
 
 void Heap::UpdateAllocationSiteFeedback(HeapObject* object) {
   if (FLAG_allocation_site_pretenuring && object->IsJSObject()) {
-    AllocationMemento* memento = AllocationMemento::FindForJSObject(
-        JSObject::cast(object), true);
+    AllocationMemento* memento = AllocationMemento::FindForHeapObject(
+        object, true);
     if (memento != NULL) {
       ASSERT(memento->IsValid());
       memento->GetAllocationSite()->IncrementMementoFoundCount();