* upstream/master: (37 commits)
  Lint
  Fix failure to apply timeout in WaitForAllAsyncOperations
  Additional code cleanup
  Fix file headers in default code cleanup
  Update TestRunner.cs (#46690)
  Make Format Document an explicit item in Code Cleanup
  Extract test helper GetDefaultDiagnosticAnalyzerService()
  Simplify type checks.
  Fix crash when typing in an indexer.
  Enforce DoesNotReturn on return; (#46659)
  Disable code fix assemblies during builds
  Expose generator internals: (#46296)
  Address feedback
  Address feedback + fix test
  Update to Microsoft.Net.Compilers.Toolset 3.8.0-2.20408.4
  Add work item attributes
  Add a new command line switch to skip analyzer execution
  Add restricted IVTs for IntelliCode
  Update to Microsoft.CodeAnalysis.Testing 1.0.1-beta1.20407.3
  Finish conversion to new test library
  ...