Erik Eckstein 1b1d5ed020 IRGen: support the @sensitive attribute ...

Call `swift_clearSensitive` after destroying or taking "sensitive" struct types.

Also, support calling C-functions with "sensitive" parameters or return values. In SIL, sensitive types are address-only and so are sensitive parameters/return values.
Though, (small) sensitive C-structs are passed directly to/from C-functions. We need re-abstract such parameter and return values for C-functions.

2024-04-09 12:01:11 +02:00

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