[jdk16] RFR: 8260608: add a regression test for 8260370

[Igor Ignatyev]

Hi all,

could you please review this small and trivial patch that adds a regression test for [8260370](https://bugs.openjdk.java.net/browse/JDK-8260370) ?

Thanks,
-- Igor

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Commit messages:
 - 8260608: add a regression test for 8260370

Changes: https://git.openjdk.java.net/jdk16/pull/137/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=137&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260608
  Stats: 72 lines in 1 file changed: 72 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/137.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/137/head:pull/137

PR: https://git.openjdk.java.net/jdk16/pull/137