[private brand checks] Stage --harmony-private-brand-checks

Bug: v8:11374
Change-Id: Ia7845f92a6b7f98e310596b182ebad7a4a097878
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2697354
Commit-Queue: Marja Hölttä <marja@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Auto-Submit: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72826}

src/flags/flag-definitions.h

@@ -249,8 +249,7 @@ 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_import_assertions, "harmony import assertions")                    \
-  V(harmony_private_brand_checks, "harmony private brand checks")
+  V(harmony_import_assertions, "harmony import assertions")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_INPROGRESS(V) \
@@ -263,7 +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_private_brand_checks, "harmony private brand checks")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V)               \