LibJS: Reorganize tests into subfolders

Libraries/LibJS/Tests/loops/for-scopes.js

@@ -0,0 +1,22 @@
+load("test-common.js");
+
+try {
+    for (var v = 5; false; );
+    assert(v == 5);
+
+    const options = {error: ReferenceError};
+
+    assertThrowsError(() => {
+        for (let l = 5; false; );
+        l;
+    }, options);
+
+    assertThrowsError(() => {
+        for (const c = 5; false; );
+        c;
+    }, options)
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}