RFR: 8328528: C2 should optimize long-typed parallel iv in an int counted loop [v26]

[Roland Westrelin]

On Mon, 21 Oct 2024 06:58:38 GMT, Kangcheng Xu <kxu at openjdk.org> wrote:

>> Currently, parallel iv optimization only happens in an int counted loop with int-typed parallel iv's. This PR adds support for long-typed iv to be optimized. 
>> 
>> Additionally, this ticket contributes to the resolution of [JDK-8275913](https://bugs.openjdk.org/browse/JDK-8275913). Meanwhile, I'm working on adding support for parallel IV replacement for long counted loops which will depend on this PR.
>
> Kangcheng Xu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update src/hotspot/share/opto/loopnode.cpp
>   
>   Co-authored-by: Christian Hagedorn <christian.hagedorn at oracle.com>

Marked as reviewed by roland (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18489#pullrequestreview-2382366567