Microsoft.CodeAnalysis.FindSymbols.Finders.IReferenceFinder.DetermineDocumentsToSearchAsync(Microsoft.CodeAnalysis.ISymbol, System.Collections.Generic.HashSet<System.String>, Microsoft.CodeAnalysis.Project, System.Collections.Immutable.IImmutableSet<Microsoft.CodeAnalysis.Document>, Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchOptions, System.Threading.CancellationToken)