8271402: mark hotspot runtime/os tests which ignore external VM flags

Reviewed-by: dholmes

test/hotspot/jtreg/runtime/os/AvailableProcessors.java

@@ -26,6 +26,7 @@
  * @bug 6515172 8148766
  * @summary Check that availableProcessors reports the correct value when running in a cpuset on linux
  * @requires os.family == "linux"
+ * @requires vm.flagless
  * @modules java.base/jdk.internal.misc
  * @library /test/lib
  * @run driver AvailableProcessors

test/hotspot/jtreg/runtime/os/TestUseCpuAllocPath.java

@@ -31,6 +31,7 @@ import jdk.test.lib.process.OutputAnalyzer;
  *   VM was either compiled on a platform which does not define CPU_ALLOC,
  *   or it is executed on a platform that does not support it.
  * @requires os.family == "linux"
+ * @requires vm.flagless
  * @modules java.base/jdk.internal.misc
  * @library /test/lib
  * @run driver TestUseCpuAllocPath