Remove elaborated bounds from trait item bounds #526
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We used to use
tcx.item_boundsto get the predicates required on a trait associated item. On top of the explicitly-written bounds, this adds parent bounds, e.g.type Item: Copywould becometype Item: Copy + Clone. These parent bounds are not necessary so we now useexplicit_item_boundswhich doesn't have them. This also gets us better spans for clauses.Companion PR to cryspen/hax#1222.