[Temporal] Fix Calendar.prototype.fields CSA

Use LoadAndUntagToWord32ObjectField instead of LoadObjectField<Uint32T>
to load the flag since it is defined as
 flags: SmiTagged<JSTemporalCalendarFlags>;

Otherwise LoadObjectField<Uint32T> will load the zero part when
v8_enable_pointer_compression = false

Add unit tests to intl (because the problem only show up on calendar
other than non iso8601.

Cq-Include-Trybots: luci.v8.try:v8_linux_mipsel_compile_rel,v8_linux_mips64el_compile_rel


Bug: v8:12848
Change-Id: I44b685af99dc9820dfa228447e2b42ae0a82464c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3617388Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80314}

src/builtins/builtins-temporal-gen.cc

@@ -106,8 +106,8 @@ TNode<JSArray> TemporalBuiltinsAssembler::CalendarFieldsArrayFromIterable(
     // Notice this spec text is in the Chapter 15 of the #sup part not #sec
     // part.
     // 7. If calendar.[[Identifier]] is "iso8601", then
-    const TNode<Uint32T> flags =
-        LoadObjectField<Uint32T>(calendar, JSTemporalCalendar::kFlagsOffset);
+    const TNode<Int32T> flags = LoadAndUntagToWord32ObjectField(
+        calendar, JSTemporalCalendar::kFlagsOffset);
     // calendar is "iso8601" while the index of calendar is 0
     const TNode<IntPtrT> index = Signed(
         DecodeWordFromWord32<JSTemporalCalendar::CalendarIndexBits>(flags));

test/intl/temporal/calendar/fields.js

+// Copyright 2022 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.
+//
+// Flags: --harmony-temporal
+
+assertEquals(["year"],
+    (new Temporal.Calendar("iso8601")).fields(["year"]));
+
+assertEquals(["month", "year"],
+    (new Temporal.Calendar("iso8601")).fields(["month", "year"]));
+
+assertEquals(["year", "era", "eraYear"],
+    (new Temporal.Calendar("japanese")).fields(["year"]));
+
+assertEquals(["month", "year", "era", "eraYear"],
+    (new Temporal.Calendar("japanese")).fields(["month", "year"]));
+
+assertEquals(["year", "era", "eraYear"],
+    (new Temporal.Calendar("roc")).fields(["year"]));
+
+assertThrows(
+    () => (new Temporal.Calendar("japanese")).fields(["hello", "world"]),
+    RangeError);