refactor(minifier): Math.pow(a,b) -> a ** (+b) instead of (+a) ** (+b)

[Boshen]

It's currently minifying twice through:

Math.pow(a, b) -> (+a) ** (+b) -> a ** (+b)

Correct me if this is wrong, i.e. we need to keep (+a) in the fold pass.

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[codspeed-hq]

CodSpeed Performance Report

Merging #9154 will not alter performance

_{Comparing 02-16-refactor_minifier_math.pow_a_b_-a_b_instead_of_a_b (b0f1c81) with main (9e3571f)}

Summary

✅ 33 untouched benchmarks

[sapphi-red]

Yeah, this is safe. I didn't do it this way initially because it was a bit difficult to verify if it's safe.

[magic-akari]

This will change the order of side effects.
For example, in the code below, before transformation, values are taken sequentially and then computed, so it outputs "effect 1" followed by "effect 2".
After transformation, however, the order of side effects will change.

Math.pow({
    valueOf() {
        console.log("effect 1");
        return 1;
    }
}, {
    valueOf() {
        console.log("effect 2");
        return 1;
    }
},)

https://playground.oxc.rs/#eNqNkMFugzAMhl8F+QQSQqPSLuze27Q9AJc0MzRTYiMnwCrEuy9pgR43XxI7v7//VxbQ0MC7Ctdq4DlfWspiTcqO+NHlRbYNUmkmzxYry33eAnYd6pDVLRRvT41gGIWyehutLa3lzvg/9PQ3tIASGJoFZKR0+BsF9QNNp6zHEqyhcDRe84DQBBlTc3MXtnsXRJHvWNwmXksYlHiUO5NH0Xg2Fkm5CICAPlTfPloPglE04acSJP9cTr735Xg/2A9aUNJjDAXoTy/1K0SF5i/sMeWPjTNkOvPQOkW9PSJrdslvtylhvpoYZVA6Snbn+JFB2J4tz4kwoVzYH+/r+gv+QaC4

[sapphi-red]

@magic-akari Like other minifiers, OXC minifier assumes .valueOf to be sideeffect free, so that order change is fine.
https://github.com/oxc-project/oxc/tree/main/crates/oxc_minifier#:~:text=.toString()%2C,console.log(%27sideeffect%27)%20%7D%20%7D