LibJS: Reorganize tests into subfolders

Libraries/LibJS/Tests/functions/function-hoisting.js

@@ -0,0 +1,37 @@
+load("test-common.js");
+
+try {
+    var callHoisted = hoisted();
+    function hoisted() {
+        return true;
+    }
+    assert(hoisted() === true);
+    assert(callHoisted === true);
+
+    {
+        var callScopedHoisted = scopedHoisted();
+        function scopedHoisted() {
+            return "foo";
+        }
+        assert(scopedHoisted() === "foo");
+        assert(callScopedHoisted === "foo");
+    }
+    assert(scopedHoisted() === "foo");
+    assert(callScopedHoisted === "foo");
+
+    const test = () => {
+        var iife = (function () {
+            return declaredLater();
+        })();
+        function declaredLater() {
+            return "yay";
+        }
+        return iife;
+    };
+    assert(typeof declaredLater === "undefined");
+    assert(test() === "yay");
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}