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/clamp.shader_test

@@ -0,0 +1,38 @@
+[pixel shader]
+float4 main(uniform float3 u) : sv_target
+{
+    return float4(clamp(u.x, u.y, u.z), clamp(0.9, u.y, u.z), clamp(u.x, -0.5, u.z), clamp(0.6, -0.4, 0.3));
+}
+
+[test]
+uniform 0 float4 -0.3 -0.1 0.7 0.0
+draw quad
+probe all rgba (-0.1, 0.7, -0.3, 0.3)
+
+
+[pixel shader]
+float4 main() : sv_target
+{
+    float3x2 a = {6, 5, 4, 3, 2, 1};
+    float2x3 b = {1, 2, 3, 4.2, 5.2, 6.2};
+    float3x4 c = 5.5;
+
+    float2x2 r = clamp(a, b, c);
+    return float4(r);
+}
+
+[test]
+draw quad
+probe all rgba (5.5, 5.0, 4.2, 5.2)
+
+
+[pixel shader fail]
+float4 main() : sv_target
+{
+    float2x2 a = {3.1, 3.1, 3.1, 3.1};
+    float2x2 b = {1, 2, 3, 4};
+    float4 c = {5.5, 4.5, 3.5, 2.5};
+
+    clamp(a, b, c);
+    return 0;
+}