RFR: 8331733: [PPC64] saving and restoring CR is not needed at most places

[Varada M]

PPC64 uses save/restore CR less often. Only LR is critical, CR is mainly needed for native-to-Java calls.

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Commit messages:
 - [PPC64] saving and restoring CR is not needed at most places
 - [PPC64] saving and restoring CR is not needed at most places

Changes: https://git.openjdk.org/jdk/pull/19494/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19494&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331733
  Stats: 75 lines in 12 files changed: 13 ins; 3 del; 59 mod
  Patch: https://git.openjdk.org/jdk/pull/19494.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19494/head:pull/19494

PR: https://git.openjdk.org/jdk/pull/19494