[jdk20u] RFR: 8305668: PPC: Non-Top Interpreted frames should be independent of ABI_ELFv2

[Tyler Steele]

I would like to backport this change in order to bring my VThread changes to jdk20u. My changes depend on this one.

Much of the line count of this change is from renaming. However, this change isn't 'just' a renaming. The core of the changes come from `frame_ppc.hpp` with the removal of `jit_abi`. Both Java and C frames had their own C-frame structure and Java's was not completely correct for the big endian ABI. These changes point both Java and C frame structures to a common ABI.

The backport did not apply cleanly--but only due to differences in the copyright header years.

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Commit messages:
 - 8305668: PPC: Non-Top Interpreted frames should be independent of ABI_ELFv2

Changes: https://git.openjdk.org/jdk20u/pull/83/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=83&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305668
  Stats: 172 lines in 21 files changed: 13 ins; 13 del; 146 mod
  Patch: https://git.openjdk.org/jdk20u/pull/83.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u.git pull/83/head:pull/83

PR: https://git.openjdk.org/jdk20u/pull/83