Move some code from Runtime_GetPrototype into a new Object::GetPrototype.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 7dbc9f41213960045901a72e1792b283d3a3daee..3bba8140e734b3c368feeec87f851fd1c24ceb79 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1286,8 +1286,11 @@ class Object {
       Isolate* isolate, Handle<Object> object, uint32_t index,
       Handle<Object> value, LanguageMode language_mode);
 
-  static inline Handle<Object> GetPrototypeSkipHiddenPrototypes(
-      Isolate* isolate, Handle<Object> receiver);
+  // Get the first non-hidden prototype.
+  static inline Handle<Object> GetPrototype(Isolate* isolate,
+                                            Handle<Object> receiver);
+  static inline Handle<Object> GetPrototypeWithAccess(Isolate* isolate,
+                                                      Handle<Object> receiver);
 
   bool HasInPrototypeChain(Isolate* isolate, Object* object);