change relative priority of auto-slice and auto-ptr

rationale: if you have an impl for &const ~[T] or &mut ~[T]
and one for &[T], the first will be more likely to work and not lead
to borrowck errors.  I could imagine us wanting to offer multiple
impls for methods we select the ptr-to-array when possible and
the slice when necessary.  Also, taking a ptr seems like fewer
adaptations than slicing, and we tend to prefer fewer adaptations.

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