check casts for individual case expressions (fixed issue #1574)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6348 f16182fa-f095-11de-8f43-4547254af6c6
obsolete

git-svn-id: http://haxe.googlecode.com/svn/trunk@6349 f16182fa-f095-11de-8f43-4547254af6c6
added missing unification of multitype @:to functions with a_this, with a temp fix for HashMap (fixed issue #1564)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6350 f16182fa-f095-11de-8f43-4547254af6c6
removed cmp argument from Lambda.has

git-svn-id: http://haxe.googlecode.com/svn/trunk@6351 f16182fa-f095-11de-8f43-4547254af6c6