LibJS: Reorganize tests into subfolders

Author: https://github.com/mattco98
Commit: https://github.com/SerenityOS/serenity/commit/4c48c9d69d3
Pull-request: https://github.com/SerenityOS/serenity/pull/2681
Reviewed-by: https://github.com/linusg

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

@@ -0,0 +1,17 @@
+load("test-common.js");
+
+try {
+    var number = 0;
+    do {
+        number++;
+    } while (number < 9);
+    assert(number === 9);
+
+    number = 0;
+    do number++; while(number < 3);
+    assert(number === 3);
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}