Saleem Abdulrasool 0301e03cc3 TDBGen: add a workaround for a workaround for async PWT ...

When a protocol witness thunk is formed to a serialised protocol
containing an `async` function, the async function pointer to the
conformance needs to be made public due to a SIL Verifier check failure
(reference to a non-fragile function from within a public fragile
function).  Add a stop-gap solution of rolling an extra emission for a
private symbol as a public symbol to avoid the error (the underlying
issue has been open for ~6y and counting as of this commit).

This was identified by swift-package-manager (#64900).

Thanks to @DougGregor and @aschwaighofer for the discussion on this!

2023-04-06 09:01:55 -07:00

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