Re: [PATCH v2 0/5] MR51: vkd3d-shader/hlsl: Improve constant handling in copy prop, and extend the use of aoffimmi modifiers.

[Francisco Casas (＠fcasas)]

Huh, sorry. This is not yet complete, I pushed by mistake.

But my plan is to keep (a) and also support replacing swizzles with constants if the required components can be resolved into a constant, which I think should be enough for this MR.

This last patch does that, but I should also implement a way to combine chained swizzles:

```hlsl
uniform uint i;

float4 main() : sv_target
{
    float4 a = {1, 2, 3, i};
    float4 b = a.xywz;
    float4 c = b.yxww;
    return c; // Should be constant (2, 1, 3, 3)
}
```

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https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/51#note_19350