RFR: 8271893: mark hotspot runtime/PerfMemDestroy/PerfMemDestroy.java test as ignoring external VM flags

[Igor Ignatyev]

Hi all,

please review this one-liner that adds `@requires vm.flagless` to `PerfMemDestroy.java` test?

Thanks,
-- Igor

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Commit messages:
 - 8271893

Changes: https://git.openjdk.java.net/jdk/pull/5003/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5003&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271893
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5003.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5003/head:pull/5003

PR: https://git.openjdk.java.net/jdk/pull/5003