https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98638

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fortran lang_decl has

struct GTY(()) lang_decl {
  /* Dummy variables.  */
  tree saved_descriptor;

and that eventually contains _121->r (SSA names which refer to def stmts
which refer to BBs).  The decl is reachable via an abstract origin.

I suppose the saved_descriptor has a tree sharing "issue" with sth
gimplified.

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