[PATCH] x86_64: Add cpu_relax to apic_wait_icr_idle

This one is adding a cpu_relax() that already existed in the i386 version.

Signed-off-by: Andreas Mohr <andi@lisas.de>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>