Precompute power if both arguments are constants (revisit)

[MaxGraey]

Precompute power operator when lhs and rhs are constants like:

const three_thousand = 3 * 10 ** 3; // will fold to 3000 during compile time

Unlike the previous PR, this only happens in optimization mode. Also added comment and TODO
Prev PR #1529

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[dcodeIO]

Seems that the math test no longer tests ipow32 now. Would it perhaps be good to add another test there to test it?

[MaxGraey]

Seems that the math test no longer tests ipow32 now. Would it perhaps be good to add another test there to test it?

It tests in debug more only

[dcodeIO]

Yeah, just wondering if there would be value in also testing ipow32 when it becomes optimized. Probably not super important, but who knows what can be seen from the optimized ipow32 code when it's modified in the future, hmm.

[MaxGraey]

I think testing in debug builds only is ok due to ipow32 is pretty simple and naive code. And if there is anything wrong with the optimizations from the release build it will appear very quickly in the rest of tests