Re: [PATCH v9 0/4] MR450: vkd3d-shader/ir: Flatten structured control flow instructions.

[Conor McCarthy (＠cmccarthy)]

The possible occurrence of `switch`, `default`, and `endswitch` with no cases makes this a bit complex, so I've added a new instruction.

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https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/450#note_52819