VideoCommon: Add vertex shader point and line expansion

Source/Core/VideoCommon/ConstantManager.h

@@ -102,9 +102,18 @@ struct VertexShaderConstants
   std::array<u32, 8> vertex_offset_texcoords;
 };
 
+enum class VSExpand : u32
+{
+  None = 0,
+  Point,
+  Line,
+};
+
 struct GeometryShaderConstants
 {
   float4 stereoparams;
   float4 lineptparams;
   int4 texoffset;
+  VSExpand vs_expand;  // Used by VS point/line expansion in ubershaders
+  u32 pad[3];
 };