CR3 has been used as structure field name in BaseLib IA32_TASK_STATE_SEGMENT.
Undefine CR3 to make sure there is no conflict to it.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Cc: Andrew Fish <afish@apple.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>