RFR: Fix problem of copyright header

[Miao Zheng]

The copyright of this test case have some problems, I try to fix this.

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Commit messages:
 - Fix problem of copyright header

Changes: https://git.openjdk.java.net/loom/pull/79/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=79&range=00
  Stats: 18 lines in 1 file changed: 4 ins; 3 del; 11 mod
  Patch: https://git.openjdk.java.net/loom/pull/79.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/79/head:pull/79

PR: https://git.openjdk.java.net/loom/pull/79