VOID
KiEnableFastSyscallReturn(
      VOID 
  );

Routine Description:

    The fast syscall/return feature cannot be used until
    certain processor specific registers have been initialized.
    This routine is called once the registers are known to
    have been set on all processors.

    This routine adjusts the exit path for system calls to
    use the appropriate sequence for the processor, it does
    this by adjusting the offset of a branch.

Arguments:

    None.

Return Value:

    None.