[Intl] Define @@toStringTag for Intl namespace

Implement tc39/ecma402#487
Also improve test/intl/toStringTag.js

see also: tc39/test262#2712

Bug: v8:10744
Change-Id: I678876aa21f169a8dfcec8e3ce974978a8847fe0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2315455
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69185}

src/init/bootstrapper.cc

@@ -2761,6 +2761,11 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
         factory->NewJSObject(isolate_->object_function(), AllocationType::kOld);
     JSObject::AddProperty(isolate_, global, "Intl", intl, DONT_ENUM);
 
+    // ecma402 #sec-Intl-toStringTag
+    // The initial value of the @@toStringTag property is the string value
+    // *"Intl"*.
+    InstallToStringTag(isolate_, intl, "Intl");
+
     SimpleInstallFunction(isolate(), intl, "getCanonicalLocales",
                           Builtins::kIntlGetCanonicalLocales, 1, false);
 

test/intl/toStringTag.js

@@ -4,26 +4,21 @@
 
 let descriptor;
 
-descriptor = Object.getOwnPropertyDescriptor(Intl.DateTimeFormat.prototype,
-                                             Symbol.toStringTag);
-
-assertEquals("Intl.DateTimeFormat", descriptor.value);
-assertFalse(descriptor.writable);
-assertFalse(descriptor.enumerable);
-assertTrue(descriptor.configurable);
-
-descriptor = Object.getOwnPropertyDescriptor(Intl.NumberFormat.prototype,
-                                             Symbol.toStringTag);
-
-assertEquals("Intl.NumberFormat", descriptor.value);
-assertFalse(descriptor.writable);
-assertFalse(descriptor.enumerable);
-assertTrue(descriptor.configurable);
-
-descriptor = Object.getOwnPropertyDescriptor(Intl.Collator.prototype,
-                                             Symbol.toStringTag);
-
-assertEquals("Intl.Collator", descriptor.value);
-assertFalse(descriptor.writable);
-assertFalse(descriptor.enumerable);
-assertTrue(descriptor.configurable);
+for (const [obj, tag] of
+    [[Intl, "Intl"],
+     [Intl.Collator.prototype, "Intl.Collator"],
+     [Intl.DateTimeFormat.prototype, "Intl.DateTimeFormat"],
+     [Intl.DisplayNames.prototype, "Intl.DisplayNames"],
+     [Intl.Locale.prototype, "Intl.Locale"],
+     [Intl.ListFormat.prototype, "Intl.ListFormat"],
+     [Intl.NumberFormat.prototype, "Intl.NumberFormat"],
+     [Intl.RelativeTimeFormat.prototype, "Intl.RelativeTimeFormat"],
+     [Intl.PluralRules.prototype, "Intl.PluralRules"],
+    ]) {
+  descriptor = Object.getOwnPropertyDescriptor(obj,
+                                               Symbol.toStringTag);
+  assertEquals(tag, descriptor.value);
+  assertFalse(descriptor.writable);
+  assertFalse(descriptor.enumerable);
+  assertTrue(descriptor.configurable);
+}

test/test262/test262.status

@@ -453,6 +453,9 @@
   # https://bugs.chromium.org/p/v8/issues/detail?id=7472
   'intl402/NumberFormat/currency-digits': [FAIL],
 
+  # http://crbug/v8/10744
+  'intl402/Intl/builtin': [FAIL],
+
   # https://bugs.chromium.org/p/v8/issues/detail?id=7831
   'language/statements/generators/generator-created-after-decl-inst': [FAIL],
   'language/expressions/generators/generator-created-after-decl-inst': [FAIL],