Extract scoping tests.

test/libsolidity/syntaxTests/scoping/scoping_for2.sol

@@ -0,0 +1,7 @@
+pragma experimental "v0.5.0";
+contract test {
+    function f() pure public {
+        for (uint x = 0; x < 10; x ++)
+            x = 2;
+    }
+}