RFR: 8375272: [IR Framework] Miscellaneous clean-ups

[Marc Chevalier]

On Thu, 22 Jan 2026 14:51:08 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

> This patch applies various unrelated clean-ups split out from a first prototype for [JDK-8375270](https://bugs.openjdk.org/browse/JDK-8375270). This should ease reviews. I left some comments in the PR to further explain some details.
> 
> Thanks,
> Christian

Overall, looks good. i'll look more in-depth, but some early comments:
- We have quite a few unused import in tests and other... Nice to clean up!
- I like the additional const in C++. Const all the things!
- Some files (e.g. test/hotspot/jtreg/compiler/lib/ir_framework/CompilePhase.java) are missing their copyright update.

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PR Review: https://git.openjdk.org/jdk/pull/29362#pullrequestreview-3697494312