[Bug target/108149] rs6000: e500mc64 was never released

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108149

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
https://gcc.gnu.org/pipermail/gcc-patches/2009-November/273251.html
was when it was added.

See also
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/1384936551-8494-1-git-send-email-tiejun.chen@windriver.com/
which mentions about e500mc64 not allowing altivec ...