Define NDEBUG before including any headers.

bench/bench-stl.cpp

@@ -1,3 +1,5 @@
+#define NDEBUG
+
 #include <vector>
 #include <list>
 #include <iterator>
@@ -14,8 +16,6 @@
 #include <sys/resource.h>
 #include <sys/time.h>
 
-#define NDEBUG
-
 using namespace std;
 
 unsigned long g_result;