Doug Gregor 43f1581c4b Emit a separate vtable entry + override thunk for async overrides that drop throws ...

Unlike with synchronous functions, an async 'throws' function and an
async non-throwing function are not ABI-compatible. This would lead to
an ABI mismatch and runtime crash when overriding an `async throws`
function with an `async` one. Deal with this ABI incompatibility by
producing an appropriate thunk.

Fixes SR-15766 / rdar://problem/88035174.

2022-01-25 11:56:24 -08:00

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