Add GetProperty/GetElement to JSReceiver and use it where possible

src/runtime/runtime-object.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
@@ skipping 1040 matching lines @@
   while (callable->IsJSBoundFunction()) {
     callable =
         handle(Handle<JSBoundFunction>::cast(callable)->bound_target_function(),
                isolate);
   }
   DCHECK(callable->IsCallable());
   // Get the "prototype" of {callable}; raise an error if it's not a receiver.
   Handle<Object> prototype;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, prototype,
-      Object::GetProperty(callable, isolate->factory()->prototype_string()));
+      JSReceiver::GetProperty(Handle<JSReceiver>::cast(callable),
+                              isolate->factory()->prototype_string()));
   if (!prototype->IsJSReceiver()) {
     THROW_NEW_ERROR_RETURN_FAILURE(
         isolate,
         NewTypeError(MessageTemplate::kInstanceofNonobjectProto, prototype));
   }
   // Return whether or not {prototype} is in the prototype chain of {object}.
   Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(object);
   Maybe<bool> result =
       JSReceiver::HasInPrototypeChain(isolate, receiver, prototype);
   MAYBE_RETURN(result, isolate->heap()->exception());
@@ skipping 50 matching lines @@
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(Object, o, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, properties, 1);
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, o, JSReceiver::DefineProperties(isolate, o, properties));
   return *o;
 }
 
 }  // namespace internal
 }  // namespace v8