Detect circular references for library and free functions

test/libsolidity/syntaxTests/freeFunctions/circular_reference1functions_first.sol

@@ -0,0 +1,18 @@
+// Checks that error is triggered no matter which order
+function l() {
+    s();
+}
+function s() {
+	new C();
+}
+contract D {
+	function f() public {
+		l();
+	}
+}
+contract C {
+	constructor() { new D(); }
+}
+// ----
+// TypeError 7813: (98-103): Circular reference to contract bytecode either via "new" or "type(...).creationCode" / "type(...).runtimeCode".
+// TypeError 7813: (187-192): Circular reference to contract bytecode either via "new" or "type(...).creationCode" / "type(...).runtimeCode".