* upstream/master: (265 commits)
  Use extra generic type parameters and apply C#-specific knowledge to all langs instead of using inheritance
  Cover all changed code paths
  Stop removing parens that are required by C#
  Fix unnecessary spans
  Failing test for preserving parens around conditional expression
  AddSynthesizedRecordMembersIfNecessary - avoid touching members that are known to have no effect on the outcome of the function. (dotnet#49610)
  Resolve follow-up comments in PR "Create default arguments during binding" (dotnet#49588)
  Remove restore and checkout from test jobs (dotnet#49452)
  3.8.* -> 3.9.*
  Update PublishData.json
  Update Versions.props
  Remove Microsoft.CodeAnalysis.VisualBasic.dll from the VSPE.OptProfTests.DDRIT_RPS_ManagedLangs_Typing runs
  Fix the ability to expand the list of analyzers in a reference
  Fix comment
  Address feedback to ensure `/warnaserror-:ID` prevents config options from bumping a warning to an error.
  parallel restore on mac/linux (dotnet#49523)
  VSMac: Make QuickFix preview resizable and add title (dotnet#49394)
  Add CallerMemberNameAttributeWithImplicitObjectCreation test (dotnet#49556)
  Update dependencies from https://github.com/dotnet/arcade build 20201120.10 (dotnet#49541)
  Clarify comment
  ...