[_fe_analyzer_shared] Base WrappedStaticType on _BaseStaticType The WrappedStaticType was wrongly based on the NonNullableStaticType even though it could be nullable through its components. This made the WrappedStaticType(Null, T & bool), i.e the Null type that is also implicitly a T, which is the nullable part of T & bool?, not seen as a subtype of Null. The WrappedStaticType is moved to be a subclass of _BaseStaticType and the isSubtypeOf implementation is updated accordingly. Closes #51897 Change-Id: I6ac87c56d709b85f0db28efd327ff41b220ea00d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292701 Reviewed-by: Paul Berry <paulberry@google.com>
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