Microsoft.CodeAnalysis.SplitOrMergeIfStatements.AbstractSplitIfStatementCodeRefactoringProvider.GetChangedRootAsync(Microsoft.CodeAnalysis.Document, Microsoft.CodeAnalysis.SyntaxNode, Microsoft.CodeAnalysis.SyntaxNode, Microsoft.CodeAnalysis.SyntaxNode, Microsoft.CodeAnalysis.SyntaxNode, System.Threading.CancellationToken)