[regexp] Stage RegExp match indices

Bug: v8:9548
Change-Id: I92b8c3b305f0e18557fb6628c42c668faf694bd3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2659512
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72454}

src/flags/flag-definitions.h

@@ -249,7 +249,6 @@ DEFINE_IMPLICATION(harmony_weak_refs_with_cleanup_some, harmony_weak_refs)
   V(harmony_regexp_sequence, "RegExp Unicode sequence properties")             \
   V(harmony_weak_refs_with_cleanup_some,                                       \
     "harmony weak references with FinalizationRegistry.prototype.cleanupSome") \
-  V(harmony_regexp_match_indices, "harmony regexp match indices")              \
   V(harmony_import_assertions, "harmony import assertions")
 
 #ifdef V8_INTL_SUPPORT
@@ -261,9 +260,10 @@ DEFINE_IMPLICATION(harmony_weak_refs_with_cleanup_some, harmony_weak_refs)
 #endif
 
 // Features that are complete (but still behind --harmony/es-staging flag).
-#define HARMONY_STAGED_BASE(V)                          \
-  V(harmony_top_level_await, "harmony top level await") \
-  V(harmony_relative_indexing_methods, "harmony relative indexing methods")
+#define HARMONY_STAGED_BASE(V)                                              \
+  V(harmony_top_level_await, "harmony top level await")                     \
+  V(harmony_relative_indexing_methods, "harmony relative indexing methods") \
+  V(harmony_regexp_match_indices, "harmony regexp match indices")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V)               \