* upstream/master: (1226 commits)
  Remove unnecessary Clone() (dotnet#45469)
  Align addition of a synthesized override of object.Equals(object? obj) in records with the latest design. (dotnet#45475)
  Move SymbolSearch down to EditorFeatures (dotnet#45505)
  VisitType in MethodToClassRewriter for function pointers.
  Fix up nondeterminism in serializing naming style preferences
  Update dependencies from https://github.com/dotnet/arcade build 20200626.2 (dotnet#45482)
  Fix typo
  Move to vnext
  Add constant inerpolated strings to the test plan, update status for records.
  Don't emit ldftn when the result is unused.
  PR Feedback: * Additional tests for nested function contexts. * Override VisitFunctionPointerLoad in MethodToClassRewriter. * Adjust debug asserts.
  Add records to compiler test plan (dotnet#45434)
  Expand comment in CreateRecoverableText
  Replace binary serialization of encoding with a custom serializer. (dotnet#45374)
  LangVersion 9 (dotnet#44911)
  Avoid loading document text in AbstractObjectBrowserLibraryManager.DocumentChangedAsync
  Allow TryGetTextVersion to pass through to the initial source
  Ensure recoverable text is in temporary storage
  Fix test
  Updates the option page type GUID to match the one in pkgdef
  ...

This reverts commit f755e8a. That
change meant our EditorFeatures code was using DllImports in the
cross-platform binary, and we weren't sure what that would do in
VS for Mac if that code ran. It also brought a dependency on
Microsoft.VisualStudio.RemoteControl, which also seems to depend on
various Windows specific APIs.

We'll finish up the decision of what to do in
dotnet#45115

…earch-to-editorfeatures

Revert "Move SymbolSearch down to EditorFeatures (#45505)"

…e_168

* upstream/master: (102 commits)
  Change contrast ratio to get close to 1.5:1 (#45526)
  Revert "Move SymbolSearch down to EditorFeatures (#45505)"
  Delay accessibility checks to avoid cycles (#45441)
  Prevent trying to convert metadata references into circular project references
  Remove unnecessary Clone() (#45469)
  Align addition of a synthesized override of object.Equals(object? obj) in records with the latest design. (#45475)
  Move SymbolSearch down to EditorFeatures (#45505)
  VisitType in MethodToClassRewriter for function pointers.
  Fix up nondeterminism in serializing naming style preferences
  Update dependencies from https://github.com/dotnet/arcade build 20200626.2 (#45482)
  Fix typo
  Move to vnext
  Add constant inerpolated strings to the test plan, update status for records.
  Don't emit ldftn when the result is unused.
  PR Feedback: * Additional tests for nested function contexts. * Override VisitFunctionPointerLoad in MethodToClassRewriter. * Adjust debug asserts.
  Add records to compiler test plan (#45434)
  Expand comment in CreateRecoverableText
  Replace binary serialization of encoding with a custom serializer. (#45374)
  LangVersion 9 (#44911)
  Avoid loading document text in AbstractObjectBrowserLibraryManager.DocumentChangedAsync
  ...