Revert of Replace SetObjectProperty / DefineObjectProperty with less powerful alternatives where relevant.

src/runtime/runtime-classes.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 <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
@@ skipping 182 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(Runtime_DefineClassMethod) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 3);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
   CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 2);
 
-  RETURN_FAILURE_ON_EXCEPTION(isolate, JSObject::DefinePropertyOrElement(
-                                           object, name, function, DONT_ENUM));
+  uint32_t index;
+  if (name->AsArrayIndex(&index)) {
+    RETURN_FAILURE_ON_EXCEPTION(
+        isolate, JSObject::SetOwnElementIgnoreAttributes(object, index,
+                                                         function, DONT_ENUM));
+  } else {
+    RETURN_FAILURE_ON_EXCEPTION(
+        isolate, JSObject::SetOwnPropertyIgnoreAttributes(object, name,
+                                                          function, DONT_ENUM));
+  }
   return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Runtime_ClassGetSourceCode) {
   HandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, fun, 0);
 
   Handle<Object> script;
@@ skipping 232 matching lines @@
   return nullptr;
 }
 
 
 RUNTIME_FUNCTION(Runtime_CallSuperWithSpread) {
   UNIMPLEMENTED();
   return nullptr;
 }
 }  // namespace internal
 }  // namespace v8