Extract test cases from ViewPureChecker

test/libsolidity/syntaxTests/viewPureChecker/selector_complex2.sol

@@ -0,0 +1,9 @@
+contract C {
+        function f() payable public returns (C) {
+        return this;
+    }
+    function g() pure public returns (bytes4) {
+        C x = C(0x123);
+        return x.f.selector;
+    }
+}