[wasm-gc] Fix a bug in CallRefIC

Bug: v8:7748

Change-Id: I7884b548276372e5dfa130fbe39d29f3cca4f530
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3310882Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78205}

src/builtins/wasm.tq

@@ -513,7 +513,7 @@ builtin CallRefIC(
       if (entries.objects[i] == funcref) {
         // Polymorphic hit.
         const count = UnsafeCast<Smi>(entries.objects[i + 1]) + SmiConstant(1);
-        vector.objects[i + 1] = count;
+        entries.objects[i + 1] = count;
         return GetTargetAndInstance(funcref);
       }
     }