RFR: 8359436: AOTCompileEagerly should not be diagnostic [v2]

[Aleksey Shipilev]

> 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`

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25799/files
  - new: https://git.openjdk.org/jdk/pull/25799/files/c00fef1b..c62f367f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25799&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25799&range=00-01

  Stats: 101 lines in 1 file changed: 101 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25799.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25799/head:pull/25799

PR: https://git.openjdk.org/jdk/pull/25799