RFR: 8266153: mark hotspot compiler/onSpinWait tests which ignore VM flags

[Igor Ignatyev]

Hi all,

could you please review this small and trivial patch that adds `@requires vm.flagless` to `compiler/onSpinWait` tests that ignore VM flags?

Thanks,
-- Igor

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Commit messages:
 - update copyright
 - 8266153

Changes: https://git.openjdk.java.net/jdk/pull/3731/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3731&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266153
  Stats: 8 lines in 2 files changed: 4 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3731.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3731/head:pull/3731

PR: https://git.openjdk.java.net/jdk/pull/3731