SIL: Skip visiting bad extensions in SILSymbolVisitor #77576
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When lazy typechecking is enabled, extensions that do not typecheck can make it to TBDGen, which would crash during its AST walk because `SILSymbolVisitor` tried to dereference the null nominal type for the extension. Resolves rdar://139320515.
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When lazy typechecking is enabled, extensions that do not typecheck can make it to TBDGen, which would crash during its AST walk because
SILSymbolVisitortried to dereference the null nominal type for the extension.Resolves rdar://139320515.