Impact: add new tracepoints

Add them to the generic IRQ code, that way every architecture
gets these new tracepoints, not just x86.

Using Steve's new 'TRACE_FORMAT', I can get function graph
trace as follows using the original two IRQ tracepoints:

3) | handle_IRQ_event() {
3) | /* (irq_handler_entry) irq=28 handler=eth0 */
3) | e1000_intr_msi() {
3) 2.460 us | __napi_schedule();
3) 9.416 us | }
3) | /* (irq_handler_exit) irq=28 handler=eth0 return=handled */
3) + 22.935 us | }

Signed-off-by: Jason Baron
Signed-off-by: Steven Rostedt
Acked-by: Peter Zijlstra
Acked-by: Masami Hiramatsu
Cc: KOSAKI Motohiro
Cc: Mathieu Desnoyers
Cc: "Frank Ch. Eigler"
Cc: Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker
Signed-off-by: Ingo Molnar