RFR: 8262379: Add regression test for JDK-8257746

[Severin Gehwolf]

Fails prior the patch of JDK-8257746, passes after. As expected.

Thoughts?

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Commit messages:
 - 8262379: Add regression test for JDK-8257746

Changes: https://git.openjdk.java.net/jdk/pull/2725/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2725&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262379
  Stats: 56 lines in 1 file changed: 56 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2725.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2725/head:pull/2725

PR: https://git.openjdk.java.net/jdk/pull/2725