Fix binary size increase because of class name loading.

Source/platform/heap/GCInfo.h

Index: Source/platform/heap/GCInfo.h
diff --git a/Source/platform/heap/GCInfo.h b/Source/platform/heap/GCInfo.h
index b13c057e9d46303d5ee24da26a09b7ed9969741c..48d0cfcca62bff4584e27dcdabf709d8261e2ac7 100644
--- a/Source/platform/heap/GCInfo.h
+++ b/Source/platform/heap/GCInfo.h
@@ -115,12 +115,14 @@ struct GCInfo {
 
     bool hasFinalizer() const { return m_nonTrivialFinalizer; }
     bool hasVTable() const { return m_hasVTable; }
-    const String className() const { return m_className(); }
     TraceCallback m_trace;
     FinalizationCallback m_finalize;
     bool m_nonTrivialFinalizer;
     bool m_hasVTable;
+#if ENABLE(GC_PROFILING)
+    const String className() const { return m_className(); }
     GetClassNameCallback m_className;
+#endif
 };
 
 #if ENABLE(ASSERT)
@@ -172,7 +174,9 @@ struct GCInfoAtBase {
             FinalizerTrait<T>::finalize,
             FinalizerTrait<T>::nonTrivialFinalizer,
             WTF::IsPolymorphic<T>::value,
+#if ENABLE(GC_PROFILING)
             TypenameStringTrait<T>::get
+#endif
         };
         RETURN_GCINFO_INDEX();
     }