Slava Pestov b0303bb5a1 Sema: Restore old behavior in ConstraintSystem::openType() ...

My change to preserve type sugar in type transforms introduced a
performance regression here, because openType() is called for
every disjunction choice.

My hope is to optimize the TypeAliasType representation and remove
this at some point, but for now, let's just restore the old
desugaring behavior in this case.

2024-10-08 11:53:45 -04:00

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