swift

82b0ec3d - [silgen] Make sure that thunks that convert to/from nonisolated(nonsending) handle hopping correctly.

[silgen] Make sure that thunks that convert to/from nonisolated(nonsending) handle hopping correctly. Specifically: 1. When we convert a function to nonisolated(nonsending), we need to make sure that in the thunk we hop upon return since nonisolated(nonsending) functions are assumed to preserve the caller's isolation. 2. When we convert a function from nonisolated(nonsending), we need to make sure that in the thunk we hop onto the actor that we are passing in as the isolated parameter of the nonisolated(nonsending) function. This ensures that the nonisolated(nonsending) function can assume that it is already on its isolated parameter's actor at function entry. rdar://155905383