* upstream/master: (148 commits)
  Remove unnecessary ArrayBuilder in MakeCallWithNoExplicitArgument (dotnet#49377)
  Revert "Skip binary for determinism checking"
  Use deterministic metadata names for emitted anonymous type fields. (dotnet#49370)
  Reuse LSP solutions if they don't need re-forking (dotnet#49305)
  Small nullability fixes (dotnet#49279)
  Create default arguments during binding (dotnet#49186)
  Clean nits
  Backport dotnet#48420 to release/dev16.8 (dotnet#49357)
  Rewrite AnalyzeFileReference.GetSupportedLanguages without LINQ (dotnet#49337)
  Use .Any extension of ImmutableArray(Of Symbol) (dotnet#48980)
  fix 'remove unnecessary cast' when doing bitwise ops on unsigned values.
  Harden, document, cross-link XunitDisposeHook
  Simplify x86 hook
  Fix split comment exporting for VB.
  Code style fix
  Overwrite xunit's app domain handling to not call AppDomain.Unload
  Revert pragma suppression
  Remove blank line
  Revert file
  Move block structure code back to Features layer
  ...