Sema: Diagnose @backDeployed functions with missing bodies in swiftinterfaces
#78414
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tshortli
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…terfaces. A `@backDeployed` function printed in a `.swiftinterface` must have a function body so that SILGen can emit a fallback copy to call when the back deployed function is unavailable. Previously, the compiler would crash in SILGen when compiling an interface containing a back deployed function without a body. Resolves rdar://141593108.
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A
@backDeployedfunction printed in a.swiftinterfacemust have a function body so that SILGen can emit a fallback copy to call when the back deployed function is unavailable. Previously, the compiler would crash in SILGen when compiling an interface containing a back deployed function without a body.This is a second attempt of #78327, which was reverted with #78327.
Resolves rdar://141593108.