Fix binary size increase because of class name loading.

Source/platform/heap/Visitor.h

Index: Source/platform/heap/Visitor.h
diff --git a/Source/platform/heap/Visitor.h b/Source/platform/heap/Visitor.h
index 1a50d167289ab6dbd5e7863c176fbfc1777adecb..9e0e4e17449e0b53a4ffa6f0caf52719b35f0712 100644
--- a/Source/platform/heap/Visitor.h
+++ b/Source/platform/heap/Visitor.h
@@ -384,6 +384,7 @@ private:
     bool m_isGlobalMarkingVisitor;
 };
 
+#if ENABLE(GC_PROFILING)
 template<typename T>
 struct TypenameStringTrait {
     static const String get()
@@ -391,6 +392,7 @@ struct TypenameStringTrait {
         return WTF::extractTypeNameFromFunctionName(WTF::extractNameFunction<T>());
     }
 };
+#endif
 
 } // namespace blink