[AArch64] Avoid materializing full masks for extractelement users of predicate-as-counter If the user of the original wide mask is an `extractelement` and the index is known to be within the first segment of the predicate-as-counter, replace it with `extractelement(pext(counter, 0))`. This avoids materializing the vector mask and produces a form that can be folded into a conditional branch when the predicate-as-counter is produced by a `whilelo`. Assisted-by: Codex
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