RFR: JDK-8299387: CompressedClassPointers.java still fails on ppc with 'Narrow klass shift: 0' missing

[Matthias Baesken]

After https://bugs.openjdk.org/browse/JDK-8283249 there seems to remain one place in the CompressedClassPointers.java test where we still sometimes run into Narrow klass shift: 3  (instead of 0) on ppc64. So the test should we relaxed in the same way we do it for aarch64 .

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Commit messages:
 - JDK-8299387

Changes: https://git.openjdk.org/jdk/pull/11795/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11795&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299387
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11795.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11795/head:pull/11795

PR: https://git.openjdk.org/jdk/pull/11795