cppgc: Fix compilation error on gcc

Without the cast, gcc might throw the following error
during compilation:

error: enumeral mismatch in conditional expression:
'cppgc::internal::StatsCollector::ScopeId' vs
'cppgc::internal::StatsCollector::ConcurrentScopeId'

Change-Id: I95e230310a0cbdc775d63657b8c407a8392a57e3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2551104Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#71325}

src/heap/cppgc/stats-collector.h

@@ -147,9 +147,10 @@ class V8_EXPORT_PRIVATE StatsCollector final {
           start_time_(v8::base::TimeTicks::Now()),
           scope_id_(scope_id) {
       DCHECK_LE(0, scope_id_);
-      DCHECK_LT(scope_id_, scope_category == kMutatorThread
-                               ? kNumScopeIds
-                               : kNumConcurrentScopeIds);
+      DCHECK_LT(static_cast<int>(scope_id_),
+                scope_category == kMutatorThread
+                    ? static_cast<int>(kNumScopeIds)
+                    : static_cast<int>(kNumConcurrentScopeIds));
       StartTrace(args...);
     }