perf llvm: Make .o saving a debug message, not an info one

Its a bit annoying to have that message, better make it a debug one.

I.e. now this message will only appear when using '-v':

  [root@quaco tracebuffer]# trace -e bristot.c
  LLVM: dumping bristot.o
  ^C[root@quaco tracebuffer]#

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-o7jd4i7s66kosec5torubqps@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/llvm-utils.c

@@ -418,10 +418,9 @@ void llvm__dump_obj(const char *path, void *obj_buf, size_t size)
 		goto out;
 	}
 
-	pr_info("LLVM: dumping %s\n", obj_path);
+	pr_debug("LLVM: dumping %s\n", obj_path);
 	if (fwrite(obj_buf, size, 1, fp) != 1)
-		pr_warning("WARNING: failed to write to file '%s': %s, skip object dumping\n",
-			   obj_path, strerror(errno));
+		pr_debug("WARNING: failed to write to file '%s': %s, skip object dumping\n", obj_path, strerror(errno));
 	fclose(fp);
 out:
 	free(obj_path);