[jdk25u] RFR: 8360783: CTW: Skip deoptimization between tiers

[Aleksey Shipilev]

On Fri, 15 Aug 2025 16:32:45 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Massively improves CTW performance. 
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `applications/ctw/modules` performance improves like in mainline
>  - [x] Linux x86_64 server fastdebug, `applications/ctw/modules`

Push approval granted.

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PR Comment: https://git.openjdk.org/jdk25u/pull/90#issuecomment-3197570293