19 of our System.IO.Pipes tests just started failing in every build, locally and in CI. It appears something has changed regarding System.Threading.Overlapped, causing the following failure in each test:

System.TypeLoadException : Could not load type 'System.Threading.Overlapped' from assembly 'System.Threading.Overlapped, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'

cc: @ericstj, @davkean, @ericeil