Implement scaled vertex buffer format emulation

These formats are unsupported by mobile GPUs so they need to be emulated in shaders instead.

src/shader_recompiler/profile.h

@@ -43,6 +43,7 @@ struct Profile {
     bool support_gl_variable_aoffi{};
     bool support_gl_sparse_textures{};
     bool support_gl_derivative_control{};
+    bool support_scaled_attributes{};
 
     bool warp_size_potentially_larger_than_guest{};