[fixes #2358] self-referential generics could cause endless loops in javac.

... unfortunately eclipse's val resolver is now very slightly worse in very exotic circumstances - spent about 4 hours trying to fix it, can't figure it out, let's move on.

test/transform/resource/before/ValWithSelfRefGenerics.java

@@ -0,0 +1,14 @@
+import lombok.val;
+public class ValWithSelfRefGenerics {
+	public void run(Thing<? extends Comparable<?>> thing, Thing<?> thing2, java.util.List<? extends Number> z) {
+		val y = z;
+		val x = thing;
+		val w = thing2;
+		val v = thing2.get();
+	}
+}
+class Thing<T extends Comparable<? super T>> {
+	public T get() {
+		return null;
+	}
+}