Added 'for x in y' loop test.
Added 'for x in y' loop test.

Just before starting to work on a optimized 'for x in y' code generation.

git-svn-id: 6db40d0534cac73ba019dccfebee869402ecad0c@2126 7a2bd370-bda8-463c-979e-2900ccfb811e

certik/pyjamas,certik/pyjamas,certik/pyjamas,certik/pyjamas