[AArch64] Combine zext of deinterleaving shuffle. (#107201)

This is part 1 of a few patches that are intended to take deinterleaving
shuffles with masks like `[0,4,8,12]`, where the shuffle is
zero-extended to a larger size, and optimize away the deinterleave. In
this case it converts them to `and(uzp1, mask)`, where the `uzp1` act
upon the elements in the larger type size to get the lanes into the
correct possitions, and the `and` performs the zext. It performs the
combine fairly late, on the legalized type so that uitofp that are
converted to uitofp(zext(..)) will also be handled.

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