winch(aarch64): abs, ceil, floor, nearest, trunc, neg, sqrt

[evacchi]

Adds a few more float instructions abs, neg, sqrt and all roundings (ceil, floor, nearest, trunc).

I skipped copysign for now, as it is less trivial and we probably want to port the same logic from cranelift :p

Temporarily submitting as draft because I want to double-check the test cases.

[github-actions]

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[saulecabrera]

The general direction looks good to me, thanks! I'll give it a more in depth review once it's marked as ready.

[evacchi]

I think it should be good to go

[saulecabrera]

LGTM, thanks!