Trap Handlers in C Patch 9 of 12:

Trap Handlers in C Patch 9 of 12:
    [NTOS]: Fix a logic bug in KiExitTrap: Always only restore segments if we came from user-mode (since they might be bogus on a kernel transition as they're not always saved), even if the caller wants segment restore.
    [NTOS]: Small perf boot: do a JMP, not a CALL into C handling code.
    [NTOS]: Make KiGetTickCount/KiCallbackReturn handled in C (as stubs).
    [NTOS]: Implement KeSynchronizeExecution in C. Move Kei386SpinOnSpinLock to C stub.
    [NTOS]: Implement overall architecture for handling hardware interrupts in C. Not used yet, since it needs C code in HAL.

svn path=/trunk/; revision=45045