RFR: 8271824: mark hotspot runtime/CompressedOops tests which ignore external VM flags

[Igor Ignatyev]

Hi all,

could you please review this patch that adds `@requires vm.flagless` to `runtime/CompressedOops/` tests as they ignore external VM flags in the JVMs which perform actual testing actions?

Thanks,
-- Igor

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Commit messages:
 - copyright year
 - 8271824

Changes: https://git.openjdk.java.net/jdk/pull/4980/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4980&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271824
  Stats: 8 lines in 5 files changed: 5 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4980.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4980/head:pull/4980

PR: https://git.openjdk.java.net/jdk/pull/4980