std: Skip element comparisons if `mem.order` args point to same memory

This optimization is used in `mem.eql`, but was missing from `order`,
`orderZ`, and `ascii.orderIgnoreCase`.
5a38dd28dcJay Petacat committed on 11/1/2025, 1:34:33 AM· committed by Ryan Liptakparent8468549
2 files changedLine totals unavailable