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

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index bbdefc14a5942122092dd2f82345b4b4d73a2bb6..b4c00788ba2d7b97e95ed1814b127d29ae7d3849 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -8256,8 +8256,8 @@ class AllocationMemento: public Struct {
   DECLARE_VERIFIER(AllocationMemento)
 
   // Returns NULL if no AllocationMemento is available for object.
-  static AllocationMemento* FindForJSObject(JSObject* object,
-                                            bool in_GC = false);
+  static AllocationMemento* FindForHeapObject(HeapObject* object,
+                                              bool in_GC = false);
   static inline AllocationMemento* cast(Object* obj);
 
  private: