Fix fromCharCodes & fromCodePoints polyfills

[MaxGraey]

Potentially fix #1324

• I've read the contributing guidelines

[dcodeIO]

Hmm, question is how well it will perform in the worst case I guess. Let's say someone doesn't use a browser or runtime JITing these well. Or in an environment where the runtime is recent but JITing is disabled. It's unlikely, but if it happens, it can be really slow.

String.fromCodePoints mostly exists because there is no good alternative, more a feature for users than for the compiler itself.

[MaxGraey]

I reverted recent changes already) Performance of CI is quite unstable. Will be great have online benchmark for compiler's speed

[dcodeIO]

Also, now I'm wondering if we can use TextDecoder? Or would there be WTF issues, hmm.

[MaxGraey]

TextDecoder also an option. But I prefer leave this as is currently. May be in future with more proper compiler's speed benchmark...

[dcodeIO]

Sounds good to me :)

[dcodeIO]

Thanks :)

[github-actions]

🎉 This PR is included in version 0.12.0 🎉

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