Pull up following revision(s) (requested by jym in ticket #994):
sys/arch/x86/x86/cpu_ucode_intel.c: revision 1.10
sys/arch/x86/x86/cpu_ucode_intel.c: revision 1.9
kmem_free() the address returned by kmem_alloc().  found by Brainy.
use the newly aligned location if we needed it.  found by kre.
Cache CPU index in the non-preemptible part otherwise it can be
unreliable (and report a CPU as patched while it was not).

(riz)