Repro steps:
1. download this project
2. Open the CatsSushiScene
3. Notice the console error: ```GLSL compilation failed:ERROR: 0:26: 'switch' : reserved word ERROR: 0:26: 'switch' : syntax error syntax error```
4. Go to Ptoject settings and switch to DX12 api.
5. Notice Console error: "d3d12: CreateGraphicsPipelineState failed."
6. Switch to DX11, and notice that the Editor crashes.

Crash stack:

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

0x00007FF615A71873 (Unity) VertexDeclarationD3D11::GetInputLayout
0x00007FF615A5ED3E (Unity) GfxDeviceD3D11Base::BindBuffersForDraw
0x00007FF615A62FAE (Unity) GfxDeviceD3D11Base::DrawBuffers
0x00007FF615B02E5E (Unity) GfxDeviceWorker::RunCommand
0x00007FF615B0623B (Unity) GfxDeviceWorker::RunExt
0x00007FF615B06605 (Unity) GfxDeviceWorker::RunGfxDeviceWorker
0x00007FF6167BC924 (Unity) Thread::RunThreadWrapper
0x00007FFFAA543034 (KERNEL32) BaseThreadInitThunk
0x00007FFFAB351471 (ntdll) RtlUserThreadStart

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

Cannot reproduce in 2018.3.0f1 or 2019.1.a10
Reproducibl ein 2019.1.0a11