This is the latest/Updated OS_MCA handler which try to do recovery
from multibit-ECC/poisoned memory-read error on user-land.
(Thank you very much for comments, Keith and Grant!)

I'd still appreciate it if anyone having good test environment
could apply my patch and could report how it works.
(especially reports on non-Tiger/non-Intel platform are welcome.)
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>