[Swf9] use native for...in on ObjectMap (fixed issue #1673)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6434 f16182fa-f095-11de-8f43-4547254af6c6
also trace all arguments for native_trace

git-svn-id: http://haxe.googlecode.com/svn/trunk@6435 f16182fa-f095-11de-8f43-4547254af6c6