RFR: 8375530: PPC64: incorrect quick verify_method_data_pointer check causes poor performance in debug build

[David Briemann]

Workaround for this fix is setting -XX:-VerifyDataPointer

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Commit messages:
 - 8375530: PPC64: incorrect quick verify_method_data_pointer check causes poor performance in debug build

Changes: https://git.openjdk.org/jdk/pull/29279/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29279&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8375530
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29279.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29279/head:pull/29279

PR: https://git.openjdk.org/jdk/pull/29279