All tests now succeed on all platforms again;

'optional' expected messages added.
expanded some tests.
Added a check if the bootclasspath supports a certain version, i.e. don't try to run a JDK7-only test if AutoClosable isn't available.

test/transform/resource/after-ecj/MixGetterVal.java

@@ -10,6 +10,8 @@ class MixGetterVal {
   public void test() {
     final @val int y = x;
     m(y);
+    final @val int a = getX();
+    m(a);
   }
   public @java.lang.SuppressWarnings("all") int getX() {
     return this.x;