Add test for ECMA402 PR 1015

tc39/ecma402#1015

Author: FrankYFTang

test/intl402/Segmenter/prototype/segment/name_of_symbol_iterator.js

@@ -0,0 +1,10 @@
+//  Copyright 2025 Google Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.Segmenter.prototype.segment
+description: Checks the "name" property of %IntlSegmentsPrototype%[%Symbol.iterator%] 
+features: [Intl.Segmenter]
+---*/
+let ss = (new Intl.Segmenter()).segment("123")[Symbol.iterator].name;
+assert.sameValue("[Symbol.iterator]", ss);