RFR: 8305227: [s390x] build broken after JDK-8231349

[Lutz Schmidt]

On Fri, 31 Mar 2023 07:06:25 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> This PR moves nmethod entry barrier  from `generate_compiler_stubs()` to `generate_final_stubs()`. Test build for fastdebug, slow debug, release and optimised. Tier1 test in fastdebug seems clean as well.

LGTM and resolves the crash observed. 
@offamitkumar Thanks for fixing!
@vnkozlov Thanks for helping out!

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Marked as reviewed by lucy (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13259#pullrequestreview-1366733435