RFR: 8353290: C2: Refactor PhaseIdealLoop::is_counted_loop() [v3]

[Kangcheng Xu]

On Tue, 22 Apr 2025 07:42:42 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> Kangcheng Xu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   WIP: review followups
>
> Was out last week but I'm seeing your last commit mentions WIP. Let me know when it's ready to have another look again :-)

@chhagedorn Sorry this took longer than I'd like. I broke down the huge `is_counted_loop()` and extracted trip-counting checks to separate calls. Hopefully this makes the code clearer. 

Could you please re-review if possible? Thank you very much!

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PR Comment: https://git.openjdk.org/jdk/pull/24458#issuecomment-2920083936