During switching BSP phase, we need to disable CPU interruput to prevent stack crashed by Timer interrupt handle. But when we enabled source debugging feature, debug timer interrupt handler (existing on both PEI and DXE) also could crash the stack used during switching BSP. So,we need to move save/restore interrupt to SwitchBSPWorker(). Cc: Feng Tian <feng.tian@intel.com> Cc: Kinney Michael D <michael.d.kinney@intel.com> Cc: Ruiyu Ni <ruiyu.ni@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Feng Tian <feng.tian@intel.com>