Reorder fullfillment errors to keep more interesting ones first

In `report_fullfillment_errors` push back `T: Sized`, `T: WellFormed`
and coercion errors to the end of the list. The pre-existing
deduplication logic eliminates redundant errors better that way, keeping
the resulting output with fewer errors than before, while also having
more detail.

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -116,7 +116,7 @@ pub(super) fn enter_wf_checking_ctxt<'tcx, F>(
 
     let errors = wfcx.select_all_or_error();
     if !errors.is_empty() {
-        infcx.err_ctxt().report_fulfillment_errors(&errors);
+        infcx.err_ctxt().report_fulfillment_errors(errors);
         return;
     }