RFR: 8369511: PPC64: compiler/vectorapi/VectorMaskCompareNotTest.java fails when running without VectorRegisters

[Martin Doerr]

Disabling the test for Power8 (see JBS issue).

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Commit messages:
 - 8369511: PPC64: compiler/vectorapi/VectorMaskCompareNotTest.java fails when running without VectorRegisters

Changes: https://git.openjdk.org/jdk/pull/27749/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27749&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369511
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27749.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27749/head:pull/27749

PR: https://git.openjdk.org/jdk/pull/27749