[Intl] Stage Intl Enumeration API

Stage 3 proposal

flag --harmony_intl_enumeration

Spec: https://tc39.es/proposal-intl-enumeration/
I2P: https://groups.google.com/a/chromium.org/g/blink-dev/c/Txtf_rSqGH8/m/e27FY33JAQAJ
Design Doc: https://docs.google.com/document/d/1lbj_YVW-xhzYNMQeHB-qDjVkf4SA-eTHYpYXx3Oaud8
https://chromestatus.com/guide/edit/5649454590853120

Bug: v8:10743
Change-Id: I0c0b8ccb8e1f143b75f6f3f4128bdfe350d299de
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3099086Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76465}

src/flags/flag-definitions.h

@@ -293,9 +293,7 @@ DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
   V(harmony_array_find_last, "harmony array find last helpers")
 
 #ifdef V8_INTL_SUPPORT
-#define HARMONY_INPROGRESS(V) \
-  HARMONY_INPROGRESS_BASE(V)  \
-  V(harmony_intl_enumeration, "Intl Enumberation API")
+#define HARMONY_INPROGRESS(V) HARMONY_INPROGRESS_BASE(V)
 #else
 #define HARMONY_INPROGRESS(V) HARMONY_INPROGRESS_BASE(V)
 #endif
@@ -307,6 +305,7 @@ DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
 #define HARMONY_STAGED(V)                                 \
   HARMONY_STAGED_BASE(V)                                  \
   V(harmony_intl_best_fit_matcher, "Intl BestFitMatcher") \
+  V(harmony_intl_enumeration, "Intl Enumberation API")    \
   V(harmony_intl_locale_info, "Intl locale info")
 #else
 #define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)