8271905: mark hotspot runtime/Metaspace tests which ignore external VM flags

Reviewed-by: stuefe

Author: iignatev

test/hotspot/jtreg/runtime/Metaspace/MaxMetaspaceSizeEnvVarTest.java

@@ -25,6 +25,7 @@
  * @test
  * @bug 8260349
  * @summary test that setting via the env-var and options file shows up as expected
+ * @requires vm.flagless
  * @library /test/lib
  * @run driver MaxMetaspaceSizeEnvVarTest
  */

test/hotspot/jtreg/runtime/Metaspace/MaxMetaspaceSizeTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,6 +27,7 @@
 /*
  * @test MaxMetaspaceSizeTest
  * @requires vm.bits == 64 & vm.opt.final.UseCompressedOops == true
+ * @requires vm.flagless
  * @bug 8087291
  * @library /test/lib
  * @run driver MaxMetaspaceSizeTest