RFR: 8373794: Move nmethod header from CodeCache

[Chris Plummer]

On Thu, 18 Dec 2025 11:43:22 GMT, Mikhail Ablakatov <mablakatov at openjdk.org> wrote:

> Though, if the SA can't be used at all with JVMCI disabled, this check can be omitted as redundant. Please let me know if that's the case.

I know of no reason why SA won't work with JVMCI disabled, but I'm also not sure if we test that so there could be bugs.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28866#discussion_r2631875749