[Bug c++/110106] [11/12/13/14 Regression] ICE on noexcept(noexcept(...)) with optional

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110106

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The full backtrace of the seg fault:
t0.cc:3:36: internal compiler error: Segmentation fault
    3 | void y(j<0> z) noexcept(noexcept(g{z}));
      |                                    ^
0x128f4af crash_signal
        /home/apinski/src/upstream-gcc-git/gcc/gcc/toplev.cc:314
0x7f37b9c54def ???
       
/usr/src/debug/glibc-2.34-60.el9.x86_64/signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0xa40753 tree_check(tree_node*, char const*, int, char const*, tree_code)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/tree.h:3539
0xa40753 is_really_empty_class(tree_node*, bool)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/class.cc:8960
0xa6aa99 potential_constant_expression_1
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/constexpr.cc:9095
0xa69714 potential_constant_expression_1
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/constexpr.cc:9309
0xa6be0c potential_constant_expression_1(tree_node*, bool, bool, bool, bool,
int)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/constexpr.cc:10131
0xa6be0c is_rvalue_constant_expression(tree_node*)
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/constexpr.cc:10215
0xba4e75 cp_parser_constant_expression
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:10801
0xba6301 cp_parser_initializer_clause
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:25522
0xba58e1 cp_parser_initializer_list
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:25812
0xba58e1 cp_parser_braced_list
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:25563
0xba8b4c cp_parser_functional_cast
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:32647
0xbb8547 cp_parser_postfix_expression
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:7703
0xba0d6b cp_parser_binary_expression
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:10147
0xba1c72 cp_parser_assignment_expression
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:10491
0xba41c3 cp_parser_expression
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:10661
0xbd6aa8 cp_parser_unary_expression
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:8937
0xba0d6b cp_parser_binary_expression
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:10147
0xba1c72 cp_parser_assignment_expression
        /home/apinski/src/upstream-gcc-git/gcc/gcc/cp/parser.cc:10491
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