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vkd3d-shader/spirv: Do not run shaders with unused SV_SampleIndex at sample frequency.

Henri is inclined to view the AMD behaviour as better here, which makes this a regression. I'm not sure I agree; I think the lack of consensus among Windows drivers means there's not a "correct" behaviour, and I feel like a HLSL shader that declares but does not use SV_SampleIndex is kind of broken in the first place. But I'm deferring to the maintainer here.

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