[jdk25u] RFR: 8361599: [PPC64] enable missing tests via jtreg requires

[Martin Doerr]

Clean backport of [JDK-8361599](https://bugs.openjdk.org/browse/JDK-8361599).

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Commit messages:
 - Backport 83feb7a2388e33835b2071cfe0e51ba8b43e241f

Changes: https://git.openjdk.org/jdk25u/pull/120/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=120&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361599
  Stats: 6 lines in 3 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk25u/pull/120.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/120/head:pull/120

PR: https://git.openjdk.org/jdk25u/pull/120