perf cs-etm: Fix corrupt inject files when only last branch option is enabled

'perf inject' with Coresight data generates files that cannot be opened
when only the last branch option is specified:

  perf inject -i perf.data --itrace=l -o inject.data
  perf script -i inject.data
  0x33faa8 [0x8]: failed to process type: 9 [Bad address]

This is because cs_etm__synth_instruction_sample() is called even when
the sample type for instructions hasn't been setup. Last branch records
are attached to instruction samples so it doesn't make sense to generate
them when --itrace=i isn't specified anyway.

This change disables all calls of cs_etm__synth_instruction_sample()
unless --itrace=i is specified, resulting in a file with no samples if
only --itrace=l is provided, rather than a bad file.
Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20220210200620.1227232-2-james.clark@arm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/cs-etm.c

@@ -1553,6 +1553,7 @@ static int cs_etm__flush(struct cs_etm_queue *etmq,
 		goto swap_packet;
 
 	if (etmq->etm->synth_opts.last_branch &&
+	    etmq->etm->synth_opts.instructions &&
 	    tidq->prev_packet->sample_type == CS_ETM_RANGE) {
 		u64 addr;
 
@@ -1610,6 +1611,7 @@ static int cs_etm__end_block(struct cs_etm_queue *etmq,
 	 * the trace.
 	 */
 	if (etmq->etm->synth_opts.last_branch &&
+	    etmq->etm->synth_opts.instructions &&
 	    tidq->prev_packet->sample_type == CS_ETM_RANGE) {
 		u64 addr;