RFR: 8311821: Simplify ParallelGCThreadsConstraintFunc after CMS removal [v5]

[Aleksey Shipilev]

On Tue, 25 Jul 2023 20:11:18 GMT, Jenny Shivayogi <duke at openjdk.org> wrote:

>> Code oddities reported by SonarCloud after CMS removal
>> Fix: moving ParallelGCThreadsConstraintFuncParallel to shared code as ParallelGCThreadsConstraintFunc
>
> Jenny Shivayogi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   changing ParallelGCThreads count in test

test/hotspot/jtreg/gc/arguments/TestParallelGCThreads.java line 116:

> 114:     }
> 115: 
> 116:     // 2147483647 == (signed int) -1

This is not technically correct: `(signed int) -1` is `-1`.
Rewrite the whole comment to: `// Test the max value for ParallelGCThreads`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14965#discussion_r1274589054