perf tools: Move u64_swap union

... to its single user's header, evsel.h.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/tip-9os1chjyz12upubfsjc71d99@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 0c9926c..0c581d0 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -91,6 +91,11 @@
 	char			*group_name;
 };
 
+union u64_swap {
+	u64 val64;
+	u32 val32[2];
+};
+
 #define hists_to_evsel(h) container_of(h, struct perf_evsel, hists)
 
 struct cpu_map;