tests: Move run-pass tests without naming conflicts to ui

src/test/ui/for-loop-while/liveness-loop-break.rs

@@ -0,0 +1,13 @@
+// run-pass
+fn test() {
+    let v;
+    loop {
+        v = 3;
+        break;
+    }
+    println!("{}", v);
+}
+
+pub fn main() {
+    test();
+}