perf auxtrace: Add itrace option "I"

Add itrace option "I" to synthesize interrupt or similar (asynchronous)
events. This will be used for Intel PT Event Trace events.

Signed-off-by: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Documentation/itrace.txt

···
 		p	synthesize power events (incl. PSB events for Intel PT)
 		o	synthesize other events recorded due to the use
 			of aux-output (refer to perf record)
+		I	synthesize interrupt or similar (asynchronous) events
+			(e.g. Intel PT Event Trace)
 		e	synthesize error events
 		d	create a debug log
 		f	synthesize first level cache events

tools/perf/util/auxtrace.c

···
 	synth_opts->ptwrites = true;
 	synth_opts->pwr_events = true;
 	synth_opts->other_events = true;
+	synth_opts->intr_events = true;
 	synth_opts->errors = true;
 	synth_opts->flc = true;
 	synth_opts->llc = true;
···
 			break;
 		case 'o':
 			synth_opts->other_events = true;
+			break;
+		case 'I':
+			synth_opts->intr_events = true;
 			break;
 		case 'e':
 			synth_opts->errors = true;

tools/perf/util/auxtrace.h

···
  * @pwr_events: whether to synthesize power events
  * @other_events: whether to synthesize other events recorded due to the use of
  *                aux_output
+ * @intr_events: whether to synthesize interrupt events
  * @errors: whether to synthesize decoder error events
  * @dont_decode: whether to skip decoding entirely
  * @log: write a decoding log
···
 	bool			ptwrites;
 	bool			pwr_events;
 	bool			other_events;
+	bool			intr_events;
 	bool			errors;
 	bool			dont_decode;
 	bool			log;
···
 "				p:	    		synthesize power events\n"			\
 "				o:			synthesize other events recorded due to the use\n" \
 "							of aux-output (refer to perf record)\n"	\
+"				I:			synthesize interrupt or similar (asynchronous) events\n" \
+"							(e.g. Intel PT Event Trace)\n" \
 "				e[flags]:		synthesize error events\n" \
 "							each flag must be preceded by + or -\n" \
 "							error flags are: o (overflow)\n" \