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}