[Bug tree-optimization/104644] [12 Regression] ICE: SIGSEGV (infinite recursion in fold_binary_loc / fold_build2_loc / generic_simplify_NE_EXPR)

["jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104644

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think the FEs rely on such trees not being folded.
It is done in fold-const-call.cc,
1186    static tree
1187    fold_const_call_1 (combined_fn fn, tree type, tree arg)
1188    {
1189      machine_mode mode = TYPE_MODE (type);
1190      machine_mode arg_mode = TYPE_MODE (TREE_TYPE (arg));
1191    
1192      if (integer_cst_p (arg))
1193        {
and integer_cst_p does:
35      /* Functions that test for certain constant types, abstracting away the
36         decision about whether to check for overflow.  */
37      
38      static inline bool
39      integer_cst_p (tree t)
40      {
41        return TREE_CODE (t) == INTEGER_CST && !TREE_OVERFLOW (t);
42      }