[turbofan] Implement the implicit ToObject for property access.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index b454e4cd15e566fd903153988877841261acc013..38b8b8905f203a3e5ba23447c2fceb7bd6adf3dc 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5518,6 +5518,8 @@ class Map: public HeapObject {
   static const int kNoConstructorFunctionIndex = 0;
   inline int GetConstructorFunctionIndex();
   inline void SetConstructorFunctionIndex(int value);
+  static MaybeHandle<JSFunction> GetConstructorFunction(
+      Handle<Map> map, Handle<Context> native_context);
 
   // Instance type.
   inline InstanceType instance_type();