8280377: MethodHandleProxies does not correctly invoke default methods with varags

Reviewed-by: alanb

src/java.base/share/classes/java/lang/reflect/ReflectAccess.java

@@ -127,4 +127,9 @@ class ReflectAccess implements jdk.internal.access.JavaLangReflectAccess {
     {
         return ctor.newInstanceWithCaller(args, true, caller);
     }
+
+    public Object invokeDefault(Object proxy, Method method, Object[] args, Class<?> caller)
+            throws Throwable {
+        return Proxy.invokeDefault(proxy, method, args, caller);
+    }
 }