Crash with spirv/win32/hlsl

when adding a new NME test, assertion with spirv:
```
{
    "title": "NME Multi Build",
    "playgroundId": "#D8AK3Z#104",
    "referenceImage": "nme-multi-build.png"
},
```

```
File: E:\dev\babylon\BNExr\build\_deps\spirv...\spirv_hlsl.cpp
Line: 20534

Expression: false
```
