RFR: 8329332: Remove CompiledMethod and CodeBlobLayout classes

[Vladimir Kozlov]

On Mon, 1 Apr 2024 18:15:43 GMT, Dean Long <dlong at openjdk.org> wrote:

> The `not_used` state was introduced for AOT. It can go away now.

Good catch, Dean.

I want to keep `nmethod::make_not_used()` method because we use it in Leyden to keep AOT code (outside of CodeCache): [nmethod.hpp#L476](https://github.com/openjdk/leyden/blob/premain/src/hotspot/share/code/nmethod.hpp#L476)
It does not use this flag value.

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PR Comment: https://git.openjdk.org/jdk/pull/18554#issuecomment-2030448462