swift

ef23f970 - [silgen] Teach SILGen how to handle nonisolated(nonsending) thunking for vtables

[silgen] Teach SILGen how to handle nonisolated(nonsending) thunking for vtables This ensures that when we generate the vtable thunk for a nonisolated(nonsending) override (or vis-a-versa), we get the ABI correct. I also added tests for all of the relevant cases for vtables that we check for protocols. rdar://151394209