Re: [PATCH v5 0/2] MR601: vkd3d-shader/dxil: Implement DX intrinsic TextureLoad.

[Conor McCarthy (＠cmccarthy)]

There's no need to emit four `MOV` to construct a vector if we have a constant vector, so in that case it now emits an `IMMCONST` and returns.

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https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/601#note_59772