Update roslyn to 5.8.0-1.26267.2#9321

davidwengier wants to merge 4 commits into

dotnet:maindotnet/vscode-csharp:mainfrom

davidwengier:update/roslyn-5-8-0-1-26267-2davidwengier/vscode-csharp:update/roslyn-5-8-0-1-26267-2Copy head branch name to clipboard