Revert "[regexp] Ship RegExp match indices"

This reverts commit 72464122.

Reason for revert:
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20gc%20stress/32046

Original change's description:
> [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}

TBR=jgruber@chromium.org,syg@chromium.org

Change-Id: I1173389082928aa5c9895ca4fb360c7ab8ec073b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:9548
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2681943Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72576}

src/flags/flag-definitions.h

@@ -262,7 +262,8 @@ DEFINE_IMPLICATION(harmony_weak_refs_with_cleanup_some, harmony_weak_refs)
 // 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_relative_indexing_methods, "harmony relative indexing methods") \
+  V(harmony_regexp_match_indices, "harmony regexp match indices")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V)               \
@@ -280,8 +281,7 @@ 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_regexp_match_indices, "harmony regexp match indices")
+  V(harmony_atomics_waitasync, "harmony Atomics.waitAsync")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_SHIPPING(V) HARMONY_SHIPPING_BASE(V)