RFR: 8290965: PPC64: Implement post-call NOPs [v2]

[Richard Reingruber]

On Wed, 27 Dec 2023 17:26:10 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> I think `kind::nmethod` should only be used if cb != nullptr which is not checked, here. Is this one performance critical?

I don't quite understand: the purpose of using `kind::nmethod` is to allow for a fast lookup of the cb which is only done if cb != nullptr.
See also my other response where `kind::nmethod` is default.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17171#discussion_r1447531558