Staging relative indexing methods

Bug: v8:10961
Change-Id: I3bd51fa1eaa448e08a99395f30c0322f23677fcf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2559138Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71417}

src/flags/flag-definitions.h

@@ -253,8 +253,7 @@ DEFINE_IMPLICATION(harmony_weak_refs_with_cleanup_some, harmony_weak_refs)
   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")                    \
-  V(harmony_relative_indexing_methods, "harmony relative indexing methods")
+  V(harmony_import_assertions, "harmony import assertions")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_INPROGRESS(V)                       \
@@ -265,8 +264,9 @@ 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")
+#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)               \