[rab/gsab] Permanently stage --harmony-rab-gsab

TF optimizations are still missing, but otherwise the feature is code
complete; further bugs at this point will be unexpected.

Bug: v8:11111
Change-Id: I21f85f29a3753d21baa0f4f76daa6e69ff46097b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3810466Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82283}

src/flags/flag-definitions.h

@@ -291,8 +291,6 @@ DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
   V(harmony_weak_refs_with_cleanup_some,                                       \
     "harmony weak references with FinalizationRegistry.prototype.cleanupSome") \
   V(harmony_import_assertions, "harmony import assertions")                    \
-  V(harmony_rab_gsab,                                                          \
-    "harmony ResizableArrayBuffer / GrowableSharedArrayBuffer")                \
   V(harmony_temporal, "Temporal")                                              \
   V(harmony_shadow_realm, "harmony ShadowRealm")                               \
   V(harmony_struct, "harmony structs, shared structs, and shared arrays")      \
@@ -307,8 +305,10 @@ DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
 #endif
 
 // Features that are complete (but still behind the --harmony flag).
-#define HARMONY_STAGED_BASE(V) \
-  V(harmony_array_grouping, "harmony array grouping")
+#define HARMONY_STAGED_BASE(V)                        \
+  V(harmony_array_grouping, "harmony array grouping") \
+  V(harmony_rab_gsab,                                 \
+    "harmony ResizableArrayBuffer / GrowableSharedArrayBuffer")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)