JS: when resolving temporary functions, don't rely on JsScope hierarchy, build this hierarchy instead, based on scoping rules for function, var, etc expressions

js/js.translator/testData/js-name-resolution/simple.expected.js

@@ -0,0 +1,7 @@
+var x = 23;
+
+function x_0() {
+    var x_0 = 42;
+    var x_1 = 99;
+    return x + x_0 + x_1;
+}