RFR: 8301226: Add clamp() methods to java.lang.Math and to StrictMath [v2]

[Tagir F. Valeev]

On Mon, 6 Feb 2023 09:03:48 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

>> @ExE-Boss I think that immediately following `isNaN` checks give enough hint that we want NaN to be here.
>
> Ah I see, a comment explaining the intention would be helpful here, then

Ok, added some explanatory comments. Hopefully they clarify the intention.

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PR: https://git.openjdk.org/jdk/pull/12428