LibJS: Reorganize tests into subfolders

Author: https://github.com/mattco98
Commit: 4c48c9d69d
Pull-request: https://github.com/SerenityOS/serenity/pull/2681
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/loops/while-basic.js

@@ -0,0 +1,21 @@
+load("test-common.js");
+
+try {
+    var number = 0;
+    while (number < 9) {
+        number++;
+    }
+    assert(number === 9);
+
+    number = 0;
+    while(number < 3) number++;
+    assert(number === 3);
+
+    while (false) {
+        assertNotReached();
+    }
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}