new free function tests

test/libsolidity/smtCheckerTests/file_level/free_runtimecode.sol

@@ -0,0 +1,20 @@
+contract C {
+	uint public x = 2;
+}
+
+function test() pure returns (bool) {
+	return type(C).runtimeCode.length > 20;
+}
+
+contract D {
+	function f() public pure {
+		assert(test()); // should hold but SMTChecker doesn't know that
+	}
+}
+// ====
+// SMTEngine: all
+// ----
+// Warning 7507: (82-101): Assertion checker does not yet support this expression.
+// Warning 7507: (82-101): Assertion checker does not yet support this expression.
+// Warning 6328: (161-175): CHC: Assertion violation happens here.\nCounterexample:\n\n\nTransaction trace:\nD.constructor()\nD.f()\n    test() -- internal call
+// Warning 7507: (82-101): Assertion checker does not yet support this expression.