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+AVX128: Blends with immediate selector completely unoptimized
+This includes the whole family of blends:

+16-bit: VPBLENDW

+32-bit: VPBLENDD, VBLENDPS

+64-bit: VBLENDPD

+

+64-bit blend is definitely the easiest where we should be able to move or zip depending.

+

+32-bit and 16-bit get a bit more spicy.

+

+These are all currently implemented with just a loop of inserts in to a zero register, so they are quite low performance atm.
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