Re: [PATCH v10 0/8] MR436: vkd3d-shader/dxil: Implement the DXIL CAST instruction.

[Conor McCarthy (＠cmccarthy)]

For consistency with later instructions I removed the calls to `is_scalar()` and instead check for int and float. It also makes the validations clearer.

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https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/436#note_51634