RFR: 8340093: C2 SuperWord: implement cost model [v4]

[Emanuel Peter]

On Wed, 5 Nov 2025 15:54:47 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Emanuel Peter has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   rename cost methods for Vladimir K
>
> Good.

@vnkozlov Thanks for reviewing and the approval!
FYI, I filed: [JDK-8371391](https://bugs.openjdk.org/browse/JDK-8371391) C2 SuperWord: rename body().body() to something more understandable

@merykitty Thanks a lot for reviewing as well, and the ideas about improving the cost model. There is actually a lot of literature out there about cost models, and various compilers employ various methods. There could be a lot of exciting work in this area, but let's take it step-by-step ;)
FYI, I filed: [JDK-8371393](https://bugs.openjdk.org/browse/JDK-8371393) C2 SuperWord: improve cost model

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PR Comment: https://git.openjdk.org/jdk/pull/27803#issuecomment-3495786238