[HLSL] List Init expects an intializer for unnamed bitfield

[spall]

struct EmptyStruct {
    int : 10;
};

[numthreads(1,1,1)]
void main() {
  EmptyStruct A = {1}; // to demonstrate you aren't supposed to initialize
  EmptyStruct E = {}; // bug here (this should be accepted but currently generates an error)
}

https://godbolt.org/z/fWG14TbsW