Slava Pestov c8aee4180e Sema: Fix a couple of crash-on-invalid problems with class inheritance ...

It is possible for ClassDecl::getSuperclassDecl() to succeed but for
ClassDecl::getSuperclass() to fail. This happens if the superclass is
a generic type and one of the generic arguments could not be resolved,
or does not satisfy the generic requirements, for example; in that
case, a BoundGenericType cannot be formed.

In a couple of places we were not prepared for this possibility.
Let's recover by making judicious use of ErrorType.

Fixes <rdar://problem/73169149>.

2021-01-17 18:06:13 -05:00

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