Fix VPA crash on defaulted direct supertypes#1810
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Fix #786 by applying computed/default annotations to direct supertypes before viewpoint adaptation.
Direct supertype computation substitutes type variables into supertypes, such as turning Box into Box.
Previously, viewpoint adaptation ran before those substituted supertypes had their default qualifiers applied, so VPA could see an unannotated type argument and crash.
This changes the ordering so direct supertypes are defaulted first, then viewpoint-adapted.