deps: V8: cherry-pick 9a98f96b6d68

Original commit message:

    [symbol-as-weakmap-key] Stage the feature

    Bug: v8:12947
    Change-Id: I0a151a6b301ee93675cc9f87a4fa24cb1be76462
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3928061
    Auto-Submit: Shu-yu Guo <syg@chromium.org>
    Commit-Queue: Marja Hölttä <marja@chromium.org>
    Reviewed-by: Marja Hölttä <marja@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#83483}

Refs: v8/v8@9a98f96
PR-URL: #51004
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

common.gypi

@@ -36,7 +36,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.30',
+    'v8_embedder_string': '-node.31',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/src/flags/flag-definitions.h

@@ -307,8 +307,7 @@ DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
     "harmony ResizableArrayBuffer / GrowableSharedArrayBuffer")                \
   V(harmony_temporal, "Temporal")                                              \
   V(harmony_shadow_realm, "harmony ShadowRealm")                               \
-  V(harmony_struct, "harmony structs and shared structs")                      \
-  V(harmony_symbol_as_weakmap_key, "harmony symbols as weakmap keys")
+  V(harmony_struct, "harmony structs and shared structs")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_INPROGRESS(V) \
@@ -319,8 +318,9 @@ 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_symbol_as_weakmap_key, "harmony symbols as weakmap keys")
 
 #ifdef V8_INTL_SUPPORT
 #define HARMONY_STAGED(V) \