use hashmap in constants buffer to speed up translation time with large files

src/hash_data/hash_data.h

@@ -0,0 +1,11 @@
+#ifndef HASH_DATA_H
+#define HASH_DATA_H
+#include <stdlib.h>
+#include <stdint.h>
+
+extern uint8_t siphash_key[16];
+extern uint8_t empty_siphash_key[16];
+
+void generate_siphash_key(uint8_t siphash_key[16]);
+uint64_t siphash64_bytes(const void *data, size_t len,uint8_t siphash_key[16]);
+#endif //HASH_DATA_H