bugfix

git-svn-id: http://haxe.googlecode.com/svn/trunk@6020 f16182fa-f095-11de-8f43-4547254af6c6
added haxe.ds.HashMap

git-svn-id: http://haxe.googlecode.com/svn/trunk@6021 f16182fa-f095-11de-8f43-4547254af6c6
allow suitable key types of Map to infer HashMap

git-svn-id: http://haxe.googlecode.com/svn/trunk@6022 f16182fa-f095-11de-8f43-4547254af6c6