RFR: 8325746: Refactor Loop Unswitching code [v2]

[Christian Hagedorn]

On Wed, 14 Feb 2024 10:59:00 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Suggestion:
>> 
>>   ResourceMark rm;
>>   GrowableArray<CheckCastPPNode*> loop_invariant_check_casts;
>
> We might as well improve the type of the nodes, and the name of the list.

I think the code of this entire method is somewhat confusing. I've just moved it and did not try to refactor this code. I can add the resource mark and do the suggested renaming/retyping.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17842#discussion_r1489340234