shader: Implement fine derivates constant propagation

src/shader_recompiler/shader_info.h

@@ -147,6 +147,7 @@ struct Info {
     bool uses_subgroup_vote{};
     bool uses_subgroup_mask{};
     bool uses_fswzadd{};
+    bool uses_derivates{};
     bool uses_typeless_image_reads{};
     bool uses_typeless_image_writes{};
     bool uses_shared_increment{};