[Bug ipa/99785] Awful lot of time spent building gl.cc in Firefox

[jmuizelaar at mozilla dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99785

--- Comment #22 from Jeff Muizelaar <jmuizelaar at mozilla dot com> ---
GCC doesn't support clang's xyzw vector attributes, so it still not easy to
build the clang path in GCC