[5.7][IDE] Skip walking serialized non-visible extension decls #59029
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Cherry-picks 4a4dded (#59024) to fix a crash when building if index-while-building is enabled and a system module contains an internal extension.
fec7a0b skipped all non-visible
ValueDecls
but missedExtensionDecls
, which have the same issue.Make sure to skip these too.
Resolves rdar://91279771.