RFR: 8359436: AOTCompileEagerly should not be diagnostic

[SendaoYan]

On Fri, 13 Jun 2025 11:31:27 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> A new AOTCompileEagerly flag introduced by [JDK-8355003](https://bugs.openjdk.org/browse/JDK-8355003) is marked as diagnostic. However, this flag guards the experimental feature, that is, whether the existence of AOT profiles should trigger immediate JIT compilation. Therefore, this flag should be at least be "experimental", rather than "diagnostic".
> 
> I don't think it makes sense to elevate this flag to full product flag, since once AOT code caching arrives, this flag would default to true, and would cause AOT loads instead of JIT compilations. Disabling the flag by user choice would be significantly counter-productive then.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `runtime/cds`

Marked as reviewed by syan (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/25799#pullrequestreview-2926932034