Update benchmarks for Python3 while retaining backwards compatibility with Python2

benchmark/eval_proto.py

@@ -28,7 +28,7 @@ def div(a, b):
     if a == MIN_INT and b == -1:
         return MAX_INT
 
-    return a / b
+    return a // b
 
 def mod(a, b):
     if b == 0:
@@ -109,4 +109,4 @@ class Benchmark:
         response.value = evaluate_expression(request)
 
     def check(self, response, expected):
-        return response.value == expected
+        return response.value == expected