correctly set iscall on OpOr display calls (fixed issue #1802)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6616 f16182fa-f095-11de-8f43-4547254af6c6
allow ` capture variables, but retain names where possible (fixed issue #1799)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6617 f16182fa-f095-11de-8f43-4547254af6c6