[serializer]: Fix DisableGCStats

This bug may lead to gc_stats tracing doesn't stop after chrome://tracing stop as expected.

Change-Id: Ibc2ece4c0ad536a99c4aece039ef546d152df10a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3709242Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Jianxiao Lu <jianxiao.lu@intel.com>
Cr-Commit-Position: refs/heads/main@{#81251}

src/snapshot/deserializer.h

@@ -259,17 +259,13 @@ class Deserializer : public SerializerDeserializer {
   class V8_NODISCARD DisableGCStats {
    public:
     explicit DisableGCStats() {
-      if (V8_LIKELY(!TracingFlags::is_gc_stats_enabled())) return;
-      was_enabled_ = true;
-      TracingFlags::gc_stats = false;
-    }
-    ~DisableGCStats() {
-      if (V8_LIKELY(!was_enabled_)) return;
-      TracingFlags::gc_stats = true;
+      original_gc_stats_ = TracingFlags::gc_stats;
+      TracingFlags::gc_stats = 0;
     }
+    ~DisableGCStats() { TracingFlags::gc_stats = original_gc_stats_; }
 
    private:
-    bool was_enabled_ = false;
+    unsigned int original_gc_stats_;
   };
   DisableGCStats no_gc_stats_;