RFR: 8271904: mark hotspot runtime/ClassFile tests which ignore external VM flags

[Igor Ignatyev]

Hi all,

could you please review the patch that adds `@requires vm.flagless` to four `runtime/ClassFile/` tests?

Thanks,
-- Igor

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Commit messages:
 - 8271904

Changes: https://git.openjdk.java.net/jdk/pull/5008/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5008&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271904
  Stats: 6 lines in 4 files changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5008.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5008/head:pull/5008

PR: https://git.openjdk.java.net/jdk/pull/5008