[JS IR] Support per-file mode and ES modules

js/js.translator/testData/box/esModules/jsModule/externalPackageInDifferentFile.mjs

@@ -0,0 +1,21 @@
+function A(x) {
+    this.x = x;
+}
+A.prototype.foo = function (y) {
+    return this.x + y;
+};
+
+var B = {
+    x: 123,
+    foo: function(y) {
+        return this.x + y;
+    }
+};
+
+function foo(y) {
+    return 323 + y;
+}
+
+var bar = 423;
+
+export { A, B, foo, bar };