RFR: 8271887: mark hotspot runtime/CDSCompressedKPtrs tests which ignore external VM flags

[Igor Ignatyev]

Hi all,

could you please review this small patch that adds `@requires vm.flagless` to both `runtime/CDSCompressedKPtrs` tests?

Thanks,
-- Igor

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Commit messages:
 - copyright
 - 8271887

Changes: https://git.openjdk.java.net/jdk/pull/4998/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4998&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271887
  Stats: 4 lines in 2 files changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4998.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4998/head:pull/4998

PR: https://git.openjdk.java.net/jdk/pull/4998