Windows swift async #2970
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Windows swift async #2970
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The Swift asynchronous calling convention requires some additional setup on the frame. In particular, the swift async register needs to be spilled relative to the frame pointer, which we now accommodate. This may require some further refinement due to frame setup restrictions on Windows, but this initial approach should be sufficient to move towards a working asynchronous support.
The frame lowering issue that forced this to be disabled has been resolved, so we should now be able to enable the `swift_async` CC.
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