i386: fix assert (__builtin_cpu_supports ("x86-64") >= 0)
Similar story as PR103661, we again return a negative number
for __builtin_cpu_supports:
Documentation says:
int __builtin_cpu_supports(const char *feature)
This function returns a positive integer if the run-time CPU supports feature and returns 0 otherwise.
while we return -
2147483648.
Moreover, I noticed "x86-64" is not a valid option for __builtin_cpu_is,
but for __builtin_cpu_supports.
PR target/107551
gcc/ChangeLog:
* config/i386/i386-builtins.cc (fold_builtin_cpu): Use same path
as for PR103661.
* doc/extend.texi: Fix "x86-64" use.
gcc/testsuite/ChangeLog:
* gcc.target/i386/builtin_target.c: Add more checks.
(cherry picked from commit
d71b20fc30965ba8326ad9363d0aca9d61eb4ed3)