[Intl] Move Intl.Locale to stage

Bug: v8:7684
Change-Id: I27586a06816863c71fc69342e8b4721ac0c32a0a
Reviewed-on: https://chromium-review.googlesource.com/c/1476293
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59712}

src/flag-definitions.h

@@ -207,8 +207,7 @@ DEFINE_IMPLICATION(harmony_private_methods, harmony_private_fields)
 #define HARMONY_INPROGRESS(V)                               \
   HARMONY_INPROGRESS_BASE(V)                                \
   V(harmony_intl_bigint, "BigInt.prototype.toLocaleString") \
-  V(harmony_intl_datetime_style, "dateStyle timeStyle for DateTimeFormat") \
-  V(harmony_locale, "Intl.Locale")
+  V(harmony_intl_datetime_style, "dateStyle timeStyle for DateTimeFormat")
 #else
 #define HARMONY_INPROGRESS(V) HARMONY_INPROGRESS_BASE(V)
 #endif
@@ -222,6 +221,7 @@ DEFINE_IMPLICATION(harmony_private_methods, harmony_private_fields)
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V)          \
   HARMONY_STAGED_BASE(V)           \
+  V(harmony_locale, "Intl.Locale") \
   V(harmony_intl_segmenter, "Intl.Segmenter")
 #else
 #define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)