[LV][EVL] Peek through combination tail-folded + predicated masks (#133430)

If a recipe was predicated and tail folded at the same time, it will
have a mask like

    EMIT vp<%header-mask> = icmp ule canonical-iv, backedge-tc
    EMIT vp<%mask> = logical-and vp<%header-mask>, vp<%pred-mask>

When converting to an EVL recipe, if the mask isn't exactly just the
header-mask we copy the whole logical-and.
We can remove this redundant logical-and (because it's now covered by
EVL) and just use vp<%pred-mask> instead.

This lets us remove the widened canonical IV in more places.

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