Commits on Oct 28, 2022

1. Remove #![allow(rustc::potential_query_instability)] from rustc_infer …

   Change reported_violations to use IndexSet
   
   It is being used to iterate and to insert, without a lot of lookups
   so hopefully it won't be a perf hit
   
   Change MiniGraph.nodes to use IndexSet
   
   It is being used to iterate and to insert, without performing lookups
   so hopefully it won't be a perf hit
   
   Change RegionConstraintData.givens to a FxIndexSet
   
   This might result in a perf hit. Remove was being used in `givens`,
   and `FxIndexSet` doesn't allow calling remove without losing the
   fixed iteration order. So it was necessary to change remove to
   `shift_remove`, but this method is slower.
   
   Change OpaqueTypesVisitor to use stable sets and maps
   
   This could also be a perf hit.
   
   Make TraitObject visitor use a stable set

   

   CastilloDel committed Oct 28, 2022
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