RFR: 8325467: Support methods with many arguments in C2 [v27]

[Daniel Lundén]

On Tue, 16 Sep 2025 10:53:04 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> src/hotspot/share/opto/regmask.hpp line 267:
>> 
>>> 265: 
>>> 266:   // Where to extend the register mask
>>> 267:   Arena* _arena;
>> 
>> Usually, we try to keep all fields at the top.
>
> Just to keep the overview.

Sure, moved next to `_rm_word_ext` now.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20404#discussion_r2352323443