Fix isAbsType prediction in TreeUnpickler #14861
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TreeUnpickler assumed that a type was an abstract type if its RHS was a TypeBounds tree. But TypeBounds trees also encode alias types, so this needs to be refined. Fixes scala#14858
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TreeUnpickler assumed that a type was an abstract type if its RHS was a TypeBounds tree.
But TypeBounds trees also encode alias types, so this needs to be refined.
Fixes #14858