cppgc: young-gen: Fix DCHECK in VisitTracedReference

Bug: chromium:1029379
Change-Id: I3523fd8b2ee2c308f8253f3a638917825666663e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3477106
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Auto-Submit: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79195}

src/heap/cppgc-js/cpp-heap.cc

@@ -75,7 +75,7 @@ class V8ToCppGCReferencesVisitor final
  private:
   void VisitHandle(const v8::TracedReference<v8::Value>& value,
                    uint16_t class_id) {
-    DCHECK(value.IsEmpty());
+    DCHECK(!value.IsEmpty());
 
     const internal::JSObject js_object =
         *reinterpret_cast<const internal::JSObject* const&>(value);