RFR: 8354636: [PPC64] Clean up comments regarding frame manager

[Martin Doerr]

Trivial comment cleanup: Replace "frame manager" by "template interpreter".

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Commit messages:
 - 8354636: [PPC64] Clean up comments regarding frame manager

Changes: https://git.openjdk.org/jdk/pull/25616/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25616&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354636
  Stats: 13 lines in 3 files changed: 0 ins; 2 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/25616.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25616/head:pull/25616

PR: https://git.openjdk.org/jdk/pull/25616