tests: Move HLSL tests to a subdirectory.

Approved-by: Giovanni Mascellani (@giomasce)
Approved-by: Francisco Casas (@fcasas)
Approved-by: Henri Verbeet (@hverbeet)
Approved-by: Alexandre Julliard (@julliard)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/248

tests/hlsl/struct-array.shader_test

@@ -0,0 +1,22 @@
+% In SM4, array elements are always aligned to the next vec4, although structs are not.
+
+[require]
+shader model >= 4.0
+
+[pixel shader]
+uniform struct
+{
+    float p, q;
+} colours[3];
+
+float4 main() : sv_target
+{
+    return float4(colours[0].q, colours[1].p, colours[2].q, colours[2].p);
+}
+
+[test]
+uniform 0 float4 0.1 0.2 0.0 0.0
+uniform 4 float4 0.3 0.4 0.0 0.0
+uniform 8 float4 0.5 0.6 0.0 0.0
+draw quad
+probe all rgba (0.2, 0.3, 0.6, 0.5)