[Bug target/60480] gcc 4.8.2 fails to do optimization on global register variables when compiling on x86_64 Linux.

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60480

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is due to x86 being a small register class target.