Combining unknown type+value symbol->unknownSymbol
Combining unknown type+value symbol->unknownSymbol

Previously, when getExternalModuleMember tried to combine unknownSymbol
from a type and unknownSymbol from a value, it combineValueAndTypeSymbol
would create a new franken-symbol that was no longer equal to
unknownSymbol.

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