LibJS: Make "break" actually work inside "switch"

Libraries/LibJS/Tests/switch-break.js

@@ -0,0 +1,25 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var i = 0;
+    var three;
+    var five;
+
+    for (; i < 9; ) {
+        switch (i) {
+        case 3:
+            three = i;
+            break;
+        case 5:
+            five = i;
+            break;
+        }
+        ++i;
+    }
+    assert(three === 3);
+    assert(five === 5);
+
+    console.log("PASS");
+} catch {
+}
+