Commits on Nov 8, 2022

1. Reduce the scope of allow(rustc::potential_query_instability) in rust… …

   …c_trait_selection
   
   Make InferCtxtExt use a FxIndexMap
   
   This should be faster, because the map is only being used to iterate,
   which is supposed to be faster with the IndexMap
   
   Make the user_computed_preds use an IndexMap
   
   It is being used mostly for iteration, so the change shouldn't result in
   a perf hit
   
   Make the RegionDeps fields use an IndexMap
   
   This change could be a perf hit. Both `larger` and `smaller` are used
   for iteration, but they are also used for insertions.
   
   Make types_without_default_bounds use an IndexMap
   
   It uses extend, but it also iterates and removes items. Not sure if
   this will be a perf hit.
   
   Make InferTtxt.reported_trait_errors use an IndexMap
   
   This change brought a lot of other changes. The map seems to have been
   mostly used for iteration, so the performance shouldn't suffer.
   
   Add FIXME to change ProvisionalEvaluationCache.map to use an IndexMap
   
   Right now this results in a perf hit. IndexMap doesn't have
   the `drain_filter` API, so in `on_completion` we now need to iterate two
   times over the map.

   

   CastilloDel committed Nov 8, 2022
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