Add benchmarks, change project structure

bench/include/BH/Bench.h

@@ -0,0 +1,25 @@
+#ifndef BH_BENCH_H
+#define BH_BENCH_H
+
+typedef struct BH_Bench BH_Bench;
+typedef void (*BH_BenchCallback)(BH_Bench *);
+
+
+#define BH_BENCH_TEST(name) \
+    static void bench##name(BH_Bench *state)
+
+
+#define BH_BENCH_ADD(name) \
+    BH_BenchAdd(#name, bench##name)
+
+
+void BH_BenchAdd(const char *name,
+                 BH_BenchCallback cb);
+
+
+int BH_BenchIter(BH_Bench *state);
+
+
+int BH_BenchRun(void);
+
+#endif /* BH_BENCH_H */