RFR: 8266230: mark hotspot compiler/c2 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/c2 ` tests that ignore VM flags?

Thanks,
-- Igor

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Commit messages:
 - update copyright year
 - 8266190

Changes: https://git.openjdk.java.net/jdk/pull/3770/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3770&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266230
  Stats: 13 lines in 6 files changed: 7 ins; 1 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3770.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3770/head:pull/3770

PR: https://git.openjdk.java.net/jdk/pull/3770