pulley: Make canonicalize-nan.wast pass

[eagr]

Helps #9783

[eagr]

cargo run --features pulley -- wast --target pulley64 ./tests/misc_testsuite/simd/canonicalize-nan.wast -W nan-canonicalization

Seems passing. Is it how the test supposed to run?

About the fn naming, I'm just kinda going along with veq32x4 and friends. If you'd prefer, say, vlef32x4 over vlteqf32x4, or vueqf64x2 over vunoeqf64x2, I'm happy to change them.

And I haven't implemented all the float condcodes, just enough to get the tests pass. I did skim through the docs, but I don't believe I understand half of the implications. It'd great to hear your inputs before I proceed implementing others.

cc @alexcrichton

[github-actions]

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