RFR: 8316694: Implement relocation of nmethod within CodeCache [v6]

[Vladimir Kozlov]

On Tue, 18 Mar 2025 15:37:00 GMT, Evgeny Astigeevich <eastigeevich at openjdk.org> wrote:

> How the second change (oops) is addressed when we create a new nmethod

Called from `nmethod()` constructor [nmethod::copy_values()](https://github.com/openjdk/jdk/blob/master/src/hotspot/share/code/nmethod.cpp#L1741) replaces handles used during compilation with oops.

Note, `new_nmethod()` holds `CodeCache_lock` and `ciEnv::register_method()` holds `Compile_lock` (and `MethodCompileQueue_lock`).

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PR Review Comment: https://git.openjdk.org/jdk/pull/23573#discussion_r2001891108