perf tools: Move event synthesizing routines to separate .c file

For better grouping, in time we may end up making most of these static,
i.e. generalizing the 'perf record' synthesizing code so that based on
the target it can do the right thing and call the needed synthesizers.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-s9zxxhk40s95pjng9panet16@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-record.c

@@ -1181,15 +1181,6 @@ static void workload_exec_failed_signal(int signo __maybe_unused,
 static void snapshot_sig_handler(int sig);
 static void alarm_sig_handler(int sig);
 
-int __weak
-perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused,
-			    struct perf_tool *tool __maybe_unused,
-			    perf_event__handler_t process __maybe_unused,
-			    struct machine *machine __maybe_unused)
-{
-	return 0;
-}
-
 static const struct perf_event_mmap_page *
 perf_evlist__pick_pc(struct evlist *evlist)
 {

tools/perf/util/Build

@@ -86,6 +86,7 @@ perf-y += stat-display.o
 perf-y += record.o
 perf-y += srcline.o
 perf-y += srccode.o
+perf-y += synthetic-events.o
 perf-y += data.o
 perf-y += tsc.o
 perf-y += cloexec.o

tools/perf/util/cs-etm.c

@@ -35,6 +35,7 @@
 #include "thread.h"
 #include "thread-stack.h"
 #include <tools/libc_compat.h>
+#include "util/synthetic-events.h"
 
 #define MAX_TIMESTAMP (~0ULL)