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

src/test/ui/macros/conditional-debug-macro-on.rs

@@ -0,0 +1,8 @@
+// run-pass
+pub fn main() {
+    // exits early if println! evaluates its arguments, otherwise it
+    // will hit the panic.
+    println!("{:?}", { if true { return; } });
+
+    panic!();
+}