RFR: 8322964: Optimize performance of CSS selector matching [v9]

[John Hendrikx]

On Sat, 25 May 2024 13:50:56 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> The code looks good. I didn't test it, but I'm fine with integrating.
>
>> Also some clarification on the contributing rules: "all Reviewers who have requested the chance to review have done so" -- does the indication at the top right of the PR count towards this or should it be a comment? :) In the first case, @nlisker and @arapte, please indicate if you wish to review this still.
> 
> If someone wants you to wait for them, they should make it clear by adding a comment. Also if someone has given substantive feedback, but hasn't (re)approved, it's good to give them a change to review.
> 
> @arapte can add a comment if he wants to review, otherwise go ahead and integrate on Monday.

@kevinrushforth @andy-goryachev-oracle @Maran23 @mstr2 

I couldn't leave this without a proper test, so I created a test for `FixedCapacitySet`.

I didn't discover any issues, but did discover there was a line of code I couldn't cover in the `OpenAddressed` variant (not even with a specially crafted test case).  I checked the code, and realized the situation can never occur, so I've removed those lines and added a comment and `assert` instead.

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PR Comment: https://git.openjdk.org/jfx/pull/1316#issuecomment-2134343376