handle internal abstract property access (fixed issue #1610)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6426 f16182fa-f095-11de-8f43-4547254af6c6
(fixed issue #1658)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6427 f16182fa-f095-11de-8f43-4547254af6c6