Failing tests in upgrade to VS 17.14p1

[333fred]

Test failures: https://dev.azure.com/dnceng-public/public/_build/results?buildId=957244&view=ms.vss-test-web.build-test-results-tab&runId=25475364&resultId=100883&paneView=debug

All appear to be of this form:

Assert.Empty() Failure: Collection was not empty
Collection: ["Program.cs(11, 24): warning CS0219: The variable '"···, "Program.cs(12, 17): warning CS0219: The variable '"···, "Program.cs(14, 32): warning CS0219: The variable '"···, "Program.cs(15, 20): warning CS0219: The variable '"···, "Program.cs(17, 24): warning CS0219: The variable '"···, ···]
   at Roslyn.VisualStudio.NewIntegrationTests.CSharp.CSharpWinForms.<DeleteControl>d__10.MoveNext() in /_/src/VisualStudio/IntegrationTest/New.IntegrationTests/CSharp/CSharpWinForms.cs:line 231
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

• Roslyn.VisualStudio.NewIntegrationTests.CSharp.CSharpWinForms.DeleteControl
• Roslyn.VisualStudio.NewIntegrationTests.CSharp.CSharpWinForms.ChangeAccessibility
• Roslyn.VisualStudio.NewIntegrationTests.CSharp.CSharpWinForms.RenameControl
• Roslyn.VisualStudio.NewIntegrationTests.CSharp.CSharpWinForms.RemoveEventHandler

One additional, unrelated failure:

System.Runtime.InteropServices.COMException : Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND))
   at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
   at Microsoft.VisualStudio.ErrorHandler.ThrowOnFailure(Int32 hr)
   at Microsoft.VisualStudio.Extensibility.Testing.ShellInProcess.<GetActiveDocumentFileNameAsync>d__4.MoveNext() in /_/src/VisualStudio/IntegrationTest/New.IntegrationTests/InProcess/ShellInProcess.cs:line 123
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Roslyn.VisualStudio.NewIntegrationTests.CSharp.CSharpGoToImplementation.<GoToImplementationFromMetadataAsSource>d__5.MoveNext() in /_/src/VisualStudio/IntegrationTest/New.IntegrationTests/CSharp/CSharpGoToImplementation.cs:line 154
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

• Roslyn.VisualStudio.NewIntegrationTests.CSharp.CSharpGoToImplementation.GoToImplementationFromMetadataAsSource(asyncNavigation: False) - The true version is passing