Fix inference circularity error triggered by exhaustive switch analysis
Fix inference circularity error triggered by exhaustive switch analysis

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