REF: JDK-8235446: confusing error message for records with no parens

[Vicente Romero]

Please review this simple fix [1] to a bug [2] reported yesterday on 
amber-dev by Tagir. This fix is just improving the current error message 
shown for code like:

record R {}

instead of the current: class, record, etc expected it prints: 
"incorrect record declaration", how does it looks?

Thanks,
Vicente

[1] http://cr.openjdk.java.net/~vromero/8235446/webrev.00/
[2] https://bugs.openjdk.java.net/browse/JDK-8235446