fixed module cyclic imports (#329)

tests/test_cyclic_import.js

@@ -0,0 +1,12 @@
+/*---
+negative:
+  phase: resolution
+  type: SyntaxError
+---*/
+// FIXME(bnoordhuis) shouldn't throw SyntaxError but that's still better
+// than segfaulting, see https://github.com/quickjs-ng/quickjs/issues/567
+import {assert} from "./assert.js"
+import {f} from "./fixture_cyclic_import.js"
+export {f}
+export function g(x) { return x + 1 }
+assert(f(1), 4)