RFR: fix for repeating annotations on type parameter args

[Joel Borggrén-Franck]

Hi Werner, Steve,

Here is a small refactoring and fix for the two javac issues with repeating annotations. This also (IMHO) fixes the javap issue so the I've cleaned up the test as my interpretation is that we emit the correct byte code.

Werner, I can't push this. If you approve, please commit the fix, should be easy enough from the diff.

Perhaps it is time to merge fixes + tests up to tl soon?

cheers
/Joel