[local-methods] Javac may invoke LambdaToMethod needlessly

Javac needlessly invoked L2M in the following case:

public class LocalMethodsNoL2MTest {
    public void foo() {
        class Inner {
            void goo() {
            }
        }
    }
}

goo() is not a local method, but it is mistakenly deemed to be.
This is a rather benign situation as it does not cause any issues,
but is a waste of compile time resources.