8163229: several regression tests have a main method that is never executed

Reviewed-by: vromero

test/langtools/tools/javac/lambda/methodReference/MethodRefToInnerWithoutOuter.java

@@ -17,7 +17,7 @@ class MethodRefToInnerBase {
     }
 }
 public class MethodRefToInnerWithoutOuter extends MethodRefToInnerBase {
-    public static void main(String[] args) {
+    public static void meth() {
         List<String> list = new ArrayList<>();
         list.stream().forEach(TestString::new);
     }