perf tools: Define Intel PT iflag synthesized event

Similar to other Intel PT synth events, define a structure to hold
information about a change to the interrupt flag.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20220124084201.2699795-11-adrian.hunter@intel.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/event.h

@@ -183,6 +183,7 @@ enum perf_synth_id {
 	PERF_SYNTH_INTEL_CBR,
 	PERF_SYNTH_INTEL_PSB,
 	PERF_SYNTH_INTEL_EVT,
+	PERF_SYNTH_INTEL_IFLAG_CHG,
 };
 
 /*
@@ -308,6 +309,18 @@ struct perf_synth_intel_evt {
 	struct perf_synth_intel_evd evd[];
 };
 
+struct perf_synth_intel_iflag_chg {
+	u32 padding;
+	union {
+		struct {
+			u32	iflag		:  1,
+				via_branch	:  1;
+		};
+		u32	flags;
+	};
+	u64	branch_ip; /* If via_branch */
+};
+
 /*
  * raw_data is always 4 bytes from an 8-byte boundary, so subtract 4 to get
  * 8-byte alignment.