RFR: 8311821: Simplify ParallelGCThreadsConstraintFunc after CMS removal [v2]

[Jenny Shivayogi]

On Fri, 21 Jul 2023 19:40:27 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> I don't think we need `ParallelGCThreadsConstraintFunc` at all now, seeing how we removed its only (?) use.

okay, so we remove 'ParallelGCThreadsConstraintFunc' as we replaced it with specifying a range instead? got it.

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PR Comment: https://git.openjdk.org/jdk/pull/14965#issuecomment-1646165715