8003280: Add lambda tests

Turn on lambda expression, method reference and default method support

Reviewed-by: jjg

langtools/test/tools/javac/lambda/MostSpecific01.java

@@ -0,0 +1,25 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8003280
+ * @summary Add lambda tests
+ *  check correctness of structural most specific test routine
+ * @compile/fail/ref=MostSpecific01.out -XDrawDiagnostics MostSpecific01.java
+ */
+
+class Test {
+
+    interface IntMapper {
+        int map();
+    }
+
+    interface LongMapper {
+        long map();
+    }
+
+    void m(IntMapper im, String s) { }
+    void m(LongMapper lm, Integer s) { }
+
+    void test() {
+        m(()->1, null);
+    }
+}