[Bug target/107261] ICE: in classify_argument, at config/i386/i386.cc:2523 on __bf16 vect argument or return value

["zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107261

--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> ---
Another testcase, for C code:
$ cat testcase.c 
__bf16 __attribute__((__vector_size__(8))) foo(void) {}
$ x86_64-pc-linux-gnu-gcc testcase.c 
testcase.c: In function 'foo':
testcase.c:1:1: internal compiler error: in classify_argument, at
config/i386/i386.cc:2523
    1 | __bf16 __attribute__((__vector_size__(8))) foo(void) {}
      | ^~~~~~
0x8437a7 classify_argument
        /repo/gcc-trunk/gcc/config/i386/i386.cc:2523
0x1788e56 classify_argument
        /repo/gcc-trunk/gcc/config/i386/i386.cc:2543
0x1788f28 examine_argument
        /repo/gcc-trunk/gcc/config/i386/i386.cc:2580
0x17898af ix86_return_in_memory
        /repo/gcc-trunk/gcc/config/i386/i386.cc:4265
0x1044e71 aggregate_value_p(tree_node const*, tree_node const*)
        /repo/gcc-trunk/gcc/function.cc:2119
0x1049981 allocate_struct_function(tree_node*, bool)
        /repo/gcc-trunk/gcc/function.cc:4848
0xd596a4 store_parm_decls()
        /repo/gcc-trunk/gcc/c/c-decl.cc:10434
0xdbdced c_parser_declaration_or_fndef
        /repo/gcc-trunk/gcc/c/c-parser.cc:2612
0xdc5eb3 c_parser_external_declaration
        /repo/gcc-trunk/gcc/c/c-parser.cc:1833
0xdc68d3 c_parser_translation_unit
        /repo/gcc-trunk/gcc/c/c-parser.cc:1695
0xdc68d3 c_parse_file()
        /repo/gcc-trunk/gcc/c/c-parser.cc:24213
0xe28a61 c_common_parse_file()
        /repo/gcc-trunk/gcc/c-family/c-opts.cc:1247
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