Add test for specialization constant workgroup size on HLSL.

reference/shaders-hlsl/comp/specialization-constant-workgroup.comp

@@ -0,0 +1,16 @@
+const uint _13 = 1u;
+const uint _15 = 1u;
+const uint3 gl_WorkGroupSize = uint3(_13, 10u, _15);
+
+RWByteAddressBuffer _10 : register(u0);
+
+void comp_main()
+{
+    _10.Store3(0, gl_WorkGroupSize);
+}
+
+[numthreads(1, 10, 1)]
+void main()
+{
+    comp_main();
+}

shaders-hlsl/comp/specialization-constant-workgroup.comp

@@ -0,0 +1,12 @@
+#version 310 es
+layout(local_size_x_id = 3, local_size_y = 10, local_size_z_id = 20) in;
+
+layout(binding = 0) buffer SSBO
+{
+	uvec3 wg_size;
+};
+
+void main()
+{
+	wg_size = gl_WorkGroupSize;
+}