getSwitchClauseTypes: exit early if getTypeOfSwitchClause is undefined (#16865)
getSwitchClauseTypes: exit early if getTypeOfSwitchClause is undefined (#16865)


donaldpipowitch/TypeScript,basarat/TypeScript,donaldpipowitch/TypeScript,kpreisser/TypeScript,SaschaNaz/TypeScript,weswigham/TypeScript,minestarks/TypeScript,weswigham/TypeScript,microsoft/TypeScript,Eyas/TypeScript,kitsonk/TypeScript,Eyas/TypeScript,Eyas/TypeScript,synaptek/TypeScript,alexeagle/TypeScript,Microsoft/TypeScript,synaptek/TypeScript,synaptek/TypeScript,chuckjaz/TypeScript,minestarks/TypeScript,Microsoft/TypeScript,Microsoft/TypeScript,nojvek/TypeScript,nojvek/TypeScript,chuckjaz/TypeScript,SaschaNaz/TypeScript,chuckjaz/TypeScript,donaldpipowitch/TypeScript,donaldpipowitch/TypeScript,kitsonk/TypeScript,SaschaNaz/TypeScript,synaptek/TypeScript,chuckjaz/TypeScript,RyanCavanaugh/TypeScript,microsoft/TypeScript,alexeagle/TypeScript,TukekeSoft/TypeScript,TukekeSoft/TypeScript,weswigham/TypeScript,kitsonk/TypeScript,nojvek/TypeScript,microsoft/TypeScript,RyanCavanaugh/TypeScript,basarat/TypeScript,alexeagle/TypeScript,TukekeSoft/TypeScript,basarat/TypeScript,RyanCavanaugh/TypeScript,kpreisser/TypeScript,kpreisser/TypeScript,Eyas/TypeScript,minestarks/TypeScript,nojvek/TypeScript,SaschaNaz/TypeScript,basarat/TypeScript