[Patch] perf: ignore perf.data.old

[Amerigo Wang]

Tell git to ignore this file.

Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>

---
diff --git a/tools/perf/.gitignore b/tools/perf/.gitignore
index fe08660..124760b 100644
--- a/tools/perf/.gitignore
+++ b/tools/perf/.gitignore
@@ -13,6 +13,7 @@ perf*.xml
 perf*.html
 common-cmds.h
 perf.data
+perf.data.old
 tags
 TAGS
 cscope*
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