RFR: 8345040: Clean up unused variables and code in `generate_native_wrapper`

[Qizheng Xing]

On Tue, 26 Nov 2024 09:27:18 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Some of variables and code are related to critical JNI natives feature, which was removed in JDK 18. This patch cleans them up.
>
> Thanks for catching and fix.
> riscv part looks good to me, seems other platforms have the similar issue, but good to have others have another look.

@Hamlin-Li @dafedafe @vnkozlov Thanks for your review!

Would anyone be willing to help review/test x86_32, ppc and s390?

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PR Comment: https://git.openjdk.org/jdk/pull/22384#issuecomment-2502986398