[Bug bootstrap/64102] ARM bootstrap fails with segfault with -mapcs in BOOT_CFLAGS

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64102

--- Comment #1 from ktkachov at gcc dot gnu.org ---
attaching gdb for a better back trace:
Program received signal SIGSEGV, Segmentation fault.
0xbeffe4fc in ?? ()
(gdb) bt
#0  0xbeffe4fc in ?? ()
#1  0x001824b8 in build_function_call_vec(unsigned int, vec<unsigned int,
va_heap, vl_ptr>, tree_node*, vec<tree_node*, va_gc, vl_embed>*,
vec<tree_node*, va_gc, vl_embed>*) ()
    at $SRC/gcc/c/c-typeck.c:2967
#2  0x001a433c in c_parser_postfix_expression_after_primary(c_parser*, unsigned
int, c_expr) () at $SRC/gcc/c/c-parser.c:7846
#3  0x001957d4 in c_parser_postfix_expression(c_parser*) () at
$SRC/gcc/c/c-parser.c:7667
#4  0x0019f318 in c_parser_unary_expression(c_parser*) () at
$SRC/gcc/c/c-parser.c:6554
#5  0x0019ff00 in c_parser_cast_expression(c_parser*, c_expr*) () at
$SRC/gcc/c/c-parser.c:6392
#6  0x001a00bc in c_parser_binary_expression(c_parser*, c_expr*, tree_node*) ()
at $SRC/gcc/c/c-parser.c:6207
#7  0x001a0bd0 in c_parser_conditional_expression(c_parser*, c_expr*,
tree_node*) () at $SRC/gcc/c/c-parser.c:5983
#8  0x001a11c0 in c_parser_expr_no_commas(c_parser*, c_expr*, tree_node*) () at
$SRC/gcc/c/c-parser.c:5901
#9  0x001a18e8 in c_parser_expression(c_parser*) () at
$SRC/gcc/c/c-parser.c:7974
#10 0x001a23dc in c_parser_expression_conv(c_parser*) () at
$SRC/gcc/c/c-parser.c:8007
#11 0x001b3e10 in c_parser_statement_after_labels(c_parser*) () at
$SRC/gcc/c/c-parser.c:5067
#12 0x001b58c4 in c_parser_compound_statement_nostart(c_parser*) () at
$SRC/gcc/c/c-parser.c:4676
#13 0x001b6054 in c_parser_compound_statement(c_parser*) () at
$SRC/gcc/c/c-parser.c:4513
#14 0x001b1a2c in c_parser_declaration_or_fndef(c_parser*, bool, bool, bool,
bool, bool, tree_node**, vec<c_token, va_heap, vl_ptr>) () at
$SRC/gcc/c/c-parser.c:1966
#15 0x001b7678 in c_parser_external_declaration(c_parser*) () at
$SRC/gcc/c/c-parser.c:1436
#16 0x001b804c in c_parse_file() () at $SRC/gcc/c/c-parser.c:1323
#17 0x00213024 in c_common_parse_file() ()
#18 0x0069c11c in compile_file() () at $SRC/gcc/toplev.c:570
#19 0x00139e30 in toplev::main(int, char**) () at $SRC/gcc/toplev.c:2041
#20 0x0013a9a8 in main () at $SRC/gcc/main.c:38
(gdb)