SWDEV-395279 - Move the headers needed to compile perftests in hip-tests (#322)

Change-Id: I9e8cea9d2cd08fb17d8955696b83404dc24a9d2b

perftests/timer.h

@@ -0,0 +1,28 @@
+#ifndef _TIMER_H_
+#define _TIMER_H_
+
+#ifdef _WIN32
+typedef __int64 i64 ;
+#endif
+#ifdef __linux__
+typedef long long i64;
+#endif
+
+class CPerfCounter {
+
+public:
+    CPerfCounter();
+    ~CPerfCounter();
+    void Start(void);
+    void Stop(void);
+    void Reset(void);
+    double GetElapsedTime(void);
+
+private:
+
+    i64 _freq;
+    i64 _clocks;
+    i64 _start;
+};
+
+#endif // _TIMER_H_