[NTOS]

[NTOS]
- Rewrite trap handler exit stubs in pure assembly, remove gcc inline assembly.
- Replace jmp to C handler with KiCallHandler macro, that expands to jmp on release builds for speed and call on debug builds to fix backtraces.
- Unroll the Syscall handler loop and use volatile keyword when reloading TrapFrame and DescriptorTable from the new stack to prevent the compiler from optimizing it away / moving it out of the loop.
- Bugcheck in KiTrap0DHandler, if the fault couldn't be resolved.
- Remove handling of V86 traps and edited traps in KiServiceExit, ASSERT to make sure they never happen.
- Replace code patching of the syscall exit handler with a function pointer.
- Use __debugbreak() instead of while(TRUE) in KiExitTrapDebugChecks

svn path=/trunk/; revision=45774