[Bug c++/68847] [6 Regression] ICE in cxx_eval_constant_expression on __atomic_compare_exchange (constexpr.c:3719) in c++

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68847

--- Comment #4 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Perhaps something like this?
Index: constexpr.c
===================================================================
--- constexpr.c (revision 232023)
+++ constexpr.c (working copy)
@@ -3560,6 +3560,7 @@ cxx_eval_constant_expression (const cons
       break;

     case CONVERT_EXPR:
+    case IMPLICIT_CONV_EXPR:
     case VIEW_CONVERT_EXPR:
     case NOP_EXPR:
     case UNARY_PLUS_EXPR: