Allan Shortlidge 7b1d4df8bc ModuleInterface: Fix decl attribute corruption in private swiftinterfaces ...

Erroneous declaration attributes were sometimes being printed in the private swiftinterfaces of modules because the changes from https://github.com/apple/swift/pull/42276 were effectively corrupting the attribute list for any decl with sythesized conformances (e.g. `Equatable`, `Hashable`). It is necessary to clone the attributes before adding them to the synthesized conformance extension decls.

Resolves rdar://94009296

2022-05-31 08:24:49 -07:00

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