Fix to allow getters and setters (or other elements with the same name) to be uniquely identified...

Fix to allow getters and setters (or other elements with the same name) to be uniquely identified (fix for http://code.google.com/p/dart/issues/detail?id=397)
Committed: https://code.google.com/p/dart/source/detail?r=1413

[keertip, 2011-11-10 18:05:26]

lgtm

[messick, 2011-11-10 18:11:59]

LGTM
As discussed, you might want to define hashCode() for SourceReferenceImpl.