[ros-diffs] [ion] 13793: Fix bugcheck code and make debugging easier for unhandled exceptions/spinlocks. fixg a race condition with tab+b, fix irql to be high_level, fix calling unsafe function by caching bugcode data, fix support for smp by using IPI, fix not-breakpointing when no debugger is there, implement KeBugCheck callbacks with Reason, fix callbacks not being called, fix proper breakpoint during bugcheck, fix errenous assert, merge with 13774.