Auto merge of #83220 - Aaron1011:fix/eval-region-cache, r=nikomatsakis

Use `EvaluatedToOkModuloRegions` whenever we erase regions

Fixes #80691

When we evaluate a trait predicate, we convert an
`EvaluatedToOk` result to `EvaluatedToOkModuloRegions` if we erased any
regions. We cache the result under a region-erased 'freshened'
predicate, so `EvaluatedToOk` may not be correct for other predicates
that have the same cache key.