RFR: 8333649: Allow different NativeCall encodings

[Hamlin Li]

On Wed, 5 Jun 2024 20:11:32 GMT, Dean Long <dlong at openjdk.org> wrote:

> Do you want to make the enum private so it can't be accessed directly?

I guess it's fine, as it's not changable on other platforms exception on riscv, and on riscv subsequent pr could remove the `instruction_size` definition in class NativeCall, and only have the method `byte_size`?

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PR Comment: https://git.openjdk.org/jdk/pull/19556#issuecomment-2153341095