JS: Add crash reproduction to test case

Author: asgerf

javascript/ql/test/library-tests/Modules/arbitrarySpecifier.ts

@@ -3,4 +3,6 @@ import { "Foo::new" as Foo_new } from "./foo.wasm"
 const foo = Foo_new()
 
 export { Foo_new as "Foo::new" }
-export type * as "Foo_types" from './mod'
+export type * as "Foo_types" from './mod'
+
+export { "<X>" as "<Y>" } from "somewhere";