[ros-diffs] [sginsberg] 43244: ReactOS SMP Bringup Lite: - Add simple and hacky spinlock implementation to HAL and kernel. It treats queued spinlocks as normal spinlocks and does not support debug timeout, but works well enough to expose bugs in spinlock usage. - Implement KiProcessDeferredReadyList, a simple wrapper around KiDeferredReadyThread. - Add missing PRCB locking in KiDeferredReadyThread. - Implement SMP handling in KiRetireDpcList. - Acquire the spinlock in KeSynchronizeExecution for SMP. - Stub