[regexp] Ship RegExp match indices

I2S:
https://groups.google.com/a/chromium.org/g/blink-dev/c/RR_dw_ZXtT0/m/xtgu5jjyAQAJ

Bug: v8:9548
Change-Id: I8ccf2f4c38f9b9204ae47162303f21d2d44498e8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2682508
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72571}

src/flags/flag-definitions.h

@@ -260,10 +260,9 @@ 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") \
-  V(harmony_regexp_match_indices, "harmony regexp match indices")
+#define HARMONY_STAGED_BASE(V)                          \
+  V(harmony_top_level_await, "harmony top level await") \
+  V(harmony_relative_indexing_methods, "harmony relative indexing methods")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V)               \
@@ -281,7 +280,8 @@ DEFINE_IMPLICATION(harmony_weak_refs_with_cleanup_some, harmony_weak_refs)
   V(harmony_weak_refs, "harmony weak references")                     \
   V(harmony_string_replaceall, "harmony String.prototype.replaceAll") \
   V(harmony_logical_assignment, "harmony logical assignment")         \
-  V(harmony_atomics_waitasync, "harmony Atomics.waitAsync")
+  V(harmony_atomics_waitasync, "harmony Atomics.waitAsync")           \
+  V(harmony_regexp_match_indices, "harmony regexp match indices")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_SHIPPING(V) HARMONY_SHIPPING_BASE(V)