RFR: 8370947: Mitigate Neoverse-N1 erratum 1542419 negative impact on GenZGC performance

[Evgeny Astigeevich]

On Thu, 20 Nov 2025 16:30:54 GMT, Andrew Haley <aph at openjdk.org> wrote:

> I think we'll also want a workaround for `CodeBuffer::relocate_code_to()`.

Also we need to fix `G1NMethodClosure::do_evacuation_and_fixup` and `ShenandoahNMethod::oops_do`. They use `nmethod::fix_oop_relocations`.

Should we do it in this PR or in separate PRs?

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PR Comment: https://git.openjdk.org/jdk/pull/28328#issuecomment-3559330327