[Bug c/65345] ICE with _Generic selection on _Atomic int

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65345

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Backtrace:

0xcbc8aa crash_signal
    /home/marek/src/gcc/gcc/toplev.c:383
0x978b80 tree_check
    /home/marek/src/gcc/gcc/tree.h:2845
0x978b80 gimple_body(tree_node*)
    /home/marek/src/gcc/gcc/gimple-expr.c:328
0xa18d07 gimple_add_tmp_var(tree_node*)
    /home/marek/src/gcc/gcc/gimplify.c:721
0x97949a create_tmp_var(tree_node*, char const*)
    /home/marek/src/gcc/gcc/gimple-expr.c:522
0x68051f convert_lvalue_to_rvalue(unsigned int, c_expr, bool, bool)
    /home/marek/src/gcc/gcc/c/c-typeck.c:2042
0x6bd29a c_parser_binary_expression
    /home/marek/src/gcc/gcc/c/c-parser.c:6379
0x6bd7d8 c_parser_conditional_expression
    /home/marek/src/gcc/gcc/c/c-parser.c:6031
0x6bdd80 c_parser_expr_no_commas
    /home/marek/src/gcc/gcc/c/c-parser.c:5949
0x6b39e8 c_parser_generic_selection
    /home/marek/src/gcc/gcc/c/c-parser.c:6856
0x6b39e8 c_parser_postfix_expression
    /home/marek/src/gcc/gcc/c/c-parser.c:7665
0x6b5572 c_parser_unary_expression
    /home/marek/src/gcc/gcc/c/c-parser.c:6602
0x6bcaaa c_parser_cast_expression
    /home/marek/src/gcc/gcc/c/c-parser.c:6440
0x6bcc74 c_parser_binary_expression
    /home/marek/src/gcc/gcc/c/c-parser.c:6255
0x6bd7d8 c_parser_conditional_expression
    /home/marek/src/gcc/gcc/c/c-parser.c:6031
0x6bdd80 c_parser_expr_no_commas
    /home/marek/src/gcc/gcc/c/c-parser.c:5949
0x6c7c0a c_parser_initializer
    /home/marek/src/gcc/gcc/c/c-parser.c:4167
0x6cd107 c_parser_declaration_or_fndef
    /home/marek/src/gcc/gcc/c/c-parser.c:1824
0x6d51c7 c_parser_external_declaration
    /home/marek/src/gcc/gcc/c/c-parser.c:1452
0x6d5a49 c_parser_translation_unit
    /home/marek/src/gcc/gcc/c/c-parser.c:1339
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