Add early out for type assertions in getTypeOfExpression
Add early out for type assertions in getTypeOfExpression

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