implement division and remainder operations

Signed-off-by: xermicus <cyrill@parity.io>

crates/integration/contracts/DivisionArithmetics.sol

@@ -0,0 +1,25 @@
+contract DivisionArithmetics {
+    function div(uint n, uint d) public pure returns (uint q) {
+        assembly {
+            q := div(n, d)
+        }
+    }
+
+    function sdiv(int n, int d) public pure returns (int q) {
+        assembly {
+            q := sdiv(n, d)
+        }
+    }
+
+    function mod(uint n, uint d) public pure returns (uint r) {
+        assembly {
+            r := mod(n, d)
+        }
+    }
+
+    function smod(int n, int d) public pure returns (int r) {
+        assembly {
+            r := smod(n, d)
+        }
+    }
+}