Microsoft.VisualStudio.LanguageServices.CodeLens.ICodeLensContext.GetReferenceCountAsync(Microsoft.VisualStudio.Language.CodeLens.Remoting.CodeLensDescriptor, Microsoft.VisualStudio.Language.CodeLens.CodeLensDescriptorContext, Microsoft.CodeAnalysis.CodeLens.ReferenceCount?, System.Threading.CancellationToken)