Add a failing test of object literals with multiple yields.
Add a failing test of object literals with multiple yields.

As reported in issue #26 by @ForbesLindesay.

jlongster/transmogrifier,liviuignat/regenerator,facebook/regenerator,juliocanares/regenerator,kittens/regenerator,Jericho25/regenerator,kittens/regenerator,RReverser/js-goto-transpiler,sebmck/regenerator,sebmck/regenerator,jlongster/unwinder,rafaelstz/regenerator,jlongster/transmogrifier,jlongster/unwinder,rafaelstz/regenerator,jlongster/unwinder,facebook/regenerator,Jericho25/regenerator,rwaldron/regenerator,liviuignat/regenerator,juliocanares/regenerator,RReverser/js-goto-transpiler,facebook/regenerator