[SPIR-V][SM6.7] Add support for RWTexture2DMS in the SPIR-V backend #5244

I am trying to implement the RWTexture2DMS feature from SM 6.7 using DXC packages from the Agility SDK.
This is a dummy shader with minimal code.
Surprisingly, the shader compiles fine for DXIL, https://godbolt.org/z/z8qvbMEjd
but fails with SPIR-V, https://godbolt.org/z/59nPrsbdo

Would this be fixed in the coming some weeks?

~SA