8272099: mark hotspot runtime/Monitor tests which ignore external VM flags

Backport-of: c495ede2c2df405e6eec0e205cd67401d7826c4c

Author: GoeLin

test/hotspot/jtreg/runtime/Monitor/MonitorUsedDeflationThresholdTest.java

@@ -29,6 +29,7 @@
  * @test
  * @bug 8226416
  * @summary Test the MonitorUsedDeflationThreshold and NoAsyncDeflationProgressMax options.
+ * @requires vm.flagless
  * @modules java.base/jdk.internal.misc
  * @library /test/lib
  * @run driver MonitorUsedDeflationThresholdTest

test/hotspot/jtreg/runtime/Monitor/SyncOnValueBasedClassTest.java

@@ -30,6 +30,7 @@
  * @test
  * @bug 8242263
  * @summary Exercise DiagnoseSyncOnValueBasedClasses diagnostic flag
+ * @requires vm.flagless
  * @library /test/lib
  * @run driver/timeout=180000 SyncOnValueBasedClassTest
  */