Remove class fields desugaring

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index c7e9cf3c9241efdb05e38f4127e41feb47b840d8..c7efb1c84eca93c85503c1867f5b5c98f108cc5a 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -671,38 +671,6 @@ RUNTIME_FUNCTION(Runtime_DefineDataPropertyInLiteral) {
   return *object;
 }
 
-RUNTIME_FUNCTION(Runtime_DefineDataProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 5);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
-  CONVERT_PROPERTY_ATTRIBUTES_CHECKED(attrs, 3);
-  CONVERT_SMI_ARG_CHECKED(set_function_name, 4);
-
-  if (set_function_name) {
-    DCHECK(value->IsJSFunction());
-    JSFunction::SetName(Handle<JSFunction>::cast(value), name,
-                        isolate->factory()->empty_string());
-  }
-
-  PropertyDescriptor desc;
-  desc.set_writable(!(attrs & ReadOnly));
-  desc.set_enumerable(!(attrs & DontEnum));
-  desc.set_configurable(!(attrs & DontDelete));
-  desc.set_value(value);
-
-  Maybe<bool> result = JSReceiver::DefineOwnProperty(isolate, receiver, name,
-                                                     &desc, Object::DONT_THROW);
-  RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
-  if (result.IsNothing()) {
-    DCHECK(isolate->has_pending_exception());
-    return isolate->heap()->exception();
-  }
-
-  return *receiver;
-}
-
 // Return property without being observable by accessors or interceptors.
 RUNTIME_FUNCTION(Runtime_GetDataProperty) {
   HandleScope scope(isolate);