Fix opaque types leaking rhs when inlined and found in type params (and a related stale symbol issue) #22655
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This PR fixes the 2 issues found in #20449, split into 2 commits.
The first commit fixes the stale symbol related issue found if the files from the issue minimization are compiled together. After suspending and retrying compilation, the classDefs that are defined directly in packages previously would sometimes not have companion objects regenerated, instead relying on the stale symbols from the previous run, causing them not to to pass the reallyExists check when looking for a specific ref. Now we make sure to go through lastKnwonDenotation, since the current one may not exists and may not point us to a Module flag when checking if to regenerate it.
The second commit fixes the opaque type alias rhs leaking in a macro. That was caused by building proxies for all parts of the type, including type arguments to opaque types - from the perspective of a type like Object[OpaqueType], the opaque type rhs should not be visible.