Backport #15667: Better infos for dependent class parameter references #15753
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We sometimes create a dependent parameter reference p.X where `p` is a path with a type that has a wildcard argument, e.g. `P[X >: L <: H].` So far the denotation of `p.X` had as info the bounds with which `X` was declared in `P`. Now it gets the actual parameter bounds instead. Fixes scala#15652 scala#15652 started failing when tuple unpackings started to use `val`s instead of `def`s in scala#14816. That caused dependent class parameter references to be created and uncovered the problem.
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Backports #15667