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/vector-indexing.shader_test

@@ -0,0 +1,51 @@
+[pixel shader]
+float4 main() : SV_TARGET
+{
+    float4 color;
+    color[0] = 0.020;
+    color[1] = 0.245;
+    color[2] = 0.351;
+    color[3] = 1.0;
+    return color;
+}
+
+[test]
+draw quad
+probe all rgba (0.02, 0.245, 0.351, 1.0)
+
+[pixel shader]
+uniform float4 m;
+
+float4 main() : SV_TARGET
+{
+    return float4(m[0], m[1], m[1], m[2]);
+}
+
+[test]
+uniform 0 float4 1.0 2.0 3.0 4.0
+draw quad
+probe all rgba (1.0, 2.0, 2.0, 3.0)
+
+
+[pixel shader fail]
+float4 main() : SV_TARGET
+{
+    float4 vec = {0, 1, 2, 3};
+    int1 idx = {3};
+
+    return vec[idx];
+}
+
+
+[pixel shader]
+float4 main() : SV_TARGET
+{
+    float4 vec = {0, 1, 2, 3};
+    int2 idx = {1, 2};
+
+    return vec[idx.y];
+}
+
+[test]
+draw quad
+probe all rgba (2.0, 2.0, 2.0, 2.0)