[Bug c/90677] [9 Regression] gcc-9.1.0 fails to build __gcc_diag__ souce: error: 'cgraph_node' is not defined as a type

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90677

--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47568
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47568&action=edit
gcc10-pr90677-2.patch

Untested fix for that.