Simplify printing of deferred mapped types
Simplify printing of deferred mapped types

Just print {} for the type of deferred symbols. This is simple although
it loses fidelity pretty badly. It will not be sufficient for projects
that want to export the result of an inference. I don't think any such
projects exist right now, though.

alexeagle/TypeScript,RyanCavanaugh/TypeScript,minestarks/TypeScript,kitsonk/TypeScript,Microsoft/TypeScript,weswigham/TypeScript,donaldpipowitch/TypeScript,minestarks/TypeScript,minestarks/TypeScript,microsoft/TypeScript,microsoft/TypeScript,Microsoft/TypeScript,donaldpipowitch/TypeScript,kpreisser/TypeScript,kpreisser/TypeScript,SaschaNaz/TypeScript,kitsonk/TypeScript,kitsonk/TypeScript,SaschaNaz/TypeScript,nojvek/TypeScript,SaschaNaz/TypeScript,donaldpipowitch/TypeScript,weswigham/TypeScript,alexeagle/TypeScript,basarat/TypeScript,donaldpipowitch/TypeScript,alexeagle/TypeScript,Microsoft/TypeScript,basarat/TypeScript,nojvek/TypeScript,RyanCavanaugh/TypeScript,basarat/TypeScript,RyanCavanaugh/TypeScript,SaschaNaz/TypeScript,nojvek/TypeScript,basarat/TypeScript,microsoft/TypeScript,kpreisser/TypeScript,nojvek/TypeScript,weswigham/TypeScript