[Intl] Update the toStringTag for Intl.{List,RelativeTime}Format

Bug: v8:7993,v8:7994
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: I058a2b8181b933dce9f71dab2b03304a424ae0ea
Reviewed-on: https://chromium-review.googlesource.com/1154237
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Daniel Ehrenberg <littledan@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54795}

src/bootstrapper.cc

@@ -4531,7 +4531,7 @@ void Genesis::InitializeGlobal_harmony_intl_list_format() {
 
   // Install the @@toStringTag property on the {prototype}.
   JSObject::AddProperty(isolate(), prototype, factory()->to_string_tag_symbol(),
-                        factory()->Object_string(),
+                        factory()->NewStringFromStaticChars("Intl.ListFormat"),
                         static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
 
   SimpleInstallFunction(isolate(), prototype, "resolvedOptions",
@@ -4628,9 +4628,10 @@ void Genesis::InitializeGlobal_harmony_intl_relative_time_format() {
       isolate());
 
   // Install the @@toStringTag property on the {prototype}.
-  JSObject::AddProperty(isolate(), prototype, factory()->to_string_tag_symbol(),
-                        factory()->Object_string(),
-                        static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
+  JSObject::AddProperty(
+      isolate(), prototype, factory()->to_string_tag_symbol(),
+      factory()->NewStringFromStaticChars("Intl.RelativeTimeFormat"),
+      static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
 
   SimpleInstallFunction(isolate(), prototype, "resolvedOptions",
                         Builtins::kRelativeTimeFormatPrototypeResolvedOptions,

test/test262/test262.status

@@ -476,6 +476,9 @@
   'intl402/RelativeTimeFormat/constructor/supportedLocalesOf/name': [FAIL],
   'intl402/RelativeTimeFormat/constructor/supportedLocalesOf/prop-desc': [FAIL],
 
+  # https://bugs.chromium.org/p/v8/issues/detail?id=7993
+  'intl402/RelativeTimeFormat/prototype/toStringTag/toStringTag': [FAIL],
+
   # https://bugs.chromium.org/p/v8/issues/detail?id=7813
   'built-ins/Array/prototype/lastIndexOf/calls-only-has-on-prototype-after-length-zeroed': [FAIL],