RFR: 8331518: Tests should not use the Classpath exception form of the legal header

[Tobias Hartmann]

Removed the Classpath exception from the copyright header of some compiler tests and benchmarks.

Thanks,
Tobias

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Commit messages:
 - 8331518: Tests should not use the Classpath exception form of the legal header

Changes: https://git.openjdk.org/jdk/pull/19047/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19047&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331518
  Stats: 15 lines in 5 files changed: 0 ins; 10 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/19047.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19047/head:pull/19047

PR: https://git.openjdk.org/jdk/pull/19047