Fix use of class terms in match analysis #21848
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When instantiating a subclass Outer.this.Bar, such that it's a subtype of Test.this.outer.Foo[X], make sure to infer the term `outer` (even if it's not a parameter). Also make sure to use those singletons when approximating the parent (to fix Outer.this.Qux instantiating).
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When instantiating a subclass Outer.this.Bar, such that it's a subtype
of Test.this.outer.Foo[X], make sure to infer the term
outer(even ifit's not a parameter). Also make sure to use those singletons when
approximating the parent (to fix Outer.this.Qux instantiating).
Fixes #21845