RFR JDK-8040292: The verifier does not check that some annotation attributes are illegally specified more than once

[harold seigel]

Hi,

Please review this relatively small JDK-9 fix for bug JDK-8040292. The 
JVM Specification states that there can only be one instance of certain 
attributes.  The VM checked this for some, but not all cases.  This fix 
adds the missing checks.

Open webrev:  http://cr.openjdk.java.net/~hseigel/bug_8040292_9/
Bug: https://bugs.openjdk.java.net/browse/JDK-8040292

The fix was tested with the Hotspot JTREG tests, JCK Lang tests, nsk 
Quick tests, and the test case in this webrev.

Thanks! Harold