Allan Shortlidge d1416ddd56 SILGen: Stub unavailable functions. ...

When `-unavailable-decl-optimization=stub` is specified, insert a call to
`_diagnoseUnavailableCodeReached()` at the beginning of the function to cause
it to trap if executed at run time.

Part of rdar://107388493

2023-05-03 15:19:31 -07:00

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