Make sure definition tree has the defined symbol #21851
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It turns out it could have the wrong symbol referring to a same-named definition in the superclass under some recursive definition of a self type. This caused a crash in pickler in scala#21755 because we now have two different definitions in two different classes that have the same symbol. Fixes scala#21755
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It turns out it could have the wrong symbol referring to a same-named definition in the superclass under some recursive definition of a self type. This caused a crash in pickler in #21755 because we now have two different definitions in two different classes that have the same symbol.
Fixes #21755