Stage Intl.DisplayNames

I2I https://mail.google.com/mail/u/0/#search/Intl.DisplayNames+Intent/KtbxLwgxBjLmZRWGMwZfjnVwNFvdndwvBq
Design Doc: https://shorturl.at/emEHW
https://www.chromestatus.com/feature/4965112605573120
Latest spec: https://tc39.es/proposal-intl-displaynames/
Spec Github: https://github.com/tc39/proposal-intl-displaynames

Bug: v8:8703
Change-Id: I3757d2131029104984d26cd5f037f90dd7b136e8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1976903Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65544}

src/flags/flag-definitions.h

@@ -213,7 +213,6 @@ DEFINE_IMPLICATION(harmony_import_meta, harmony_dynamic_import)
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_INPROGRESS(V)                       \
   HARMONY_INPROGRESS_BASE(V)                        \
-  V(harmony_intl_displaynames, "Intl.DisplayNames") \
   V(harmony_intl_displaynames_date_types, "Intl.DisplayNames date types")
 #else
 #define HARMONY_INPROGRESS(V) HARMONY_INPROGRESS_BASE(V)
@@ -226,6 +225,7 @@ DEFINE_IMPLICATION(harmony_import_meta, harmony_dynamic_import)
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V)                                  \
   HARMONY_STAGED_BASE(V)                                   \
+  V(harmony_intl_displaynames, "Intl.DisplayNames")        \
   V(harmony_intl_dateformat_day_period,                    \
     "Add dayPeriod option to DateTimeFormat")              \
   V(harmony_intl_dateformat_fractional_second_digits,      \