[java/cs] fixed assertion error when using old overload definition


git-svn-id: http://haxe.googlecode.com/svn/trunk@6364 f16182fa-f095-11de-8f43-4547254af6c6
added clarifying comment

git-svn-id: http://haxe.googlecode.com/svn/trunk@6365 f16182fa-f095-11de-8f43-4547254af6c6