[Bug c/123987] isinfl isinff incorrectly for x86 and arm64

[rearnsha at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123987

--- Comment #9 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
If you want to get the glibc implementation compile with -fno-builtin-isinff,
etc