Steps to reproduce:
1. Create a new project in 2018.2
2. Switch platform to UWP
3. Enable XR feature and in the Holographic window set "Emulation Mode" to "Simulate in Editor"
4. Save scene
5. Upgrade project to 2018.3 or 2019.1
6. Check if "Emulation Mode" is set to "Simulate in Editor"
7. Enter play mode

Results: On entering play mode Unity editor crashes

Reproduced with: 2019.1.0a13, 2018.3.1f1
Not reproducible with: 2018.3.0a5
Regression introduced in: 2018.3.0a6

========== OUTPUTTING STACK TRACE ==================

0x00007FF692B8BEB4 (Unity) VRDeviceHoloLens::BeginRenderingToDeviceGfxThread
0x00007FF692B8E93F (Unity) HoloLensEventGfxThreadCallback
0x00007FF692B25EAE (Unity) VRDevice::SendVRDeviceEvent
0x00007FF6932A90C0 (Unity) GfxDevice::SendVRDeviceEvent
0x00007FF693D1B977 (Unity) GfxDeviceWorker::RunCommand
0x00007FF693D1D4BB (Unity) GfxDeviceWorker::RunExt
0x00007FF693D1D885 (Unity) GfxDeviceWorker::RunGfxDeviceWorker
0x00007FF6948B7287 (Unity) Thread::RunThreadWrapper
0x00007FFC49A27E94 (KERNEL32) BaseThreadInitThunk
0x00007FFC4C3DA251 (ntdll) RtlUserThreadStart

========== END OF STACKTRACE ===========