added $field check to Typer

git-svn-id: http://haxe.googlecode.com/svn/trunk@5796 f16182fa-f095-11de-8f43-4547254af6c6
added get_pattern_locals to Interp

git-svn-id: http://haxe.googlecode.com/svn/trunk@5797 f16182fa-f095-11de-8f43-4547254af6c6