RFR: 8271821: mark hotspot runtime/MinimalVM tests which ignore external VM flags

[Igor Ignatyev]

Hi all,

could you please review this patch that adds `@requires vm.flagless` to `runtime/MinimalVM/` tests as they ignore external VM flags?

Thanks,
-- Igor

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Commit messages:
 - copyright year
 - 8271821

Changes: https://git.openjdk.java.net/jdk/pull/4979/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4979&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271821
  Stats: 12 lines in 6 files changed: 6 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4979.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4979/head:pull/4979

PR: https://git.openjdk.java.net/jdk/pull/4979