message: Default to lod 0 if lod parameter is missing
diff: @@ -551,8 +551,10 @@ public:
  if(coords >= 3)
  params.texel_uvw.z = uv.value.u.z;
  - if(!buffer)
  + if(!buffer && operands.flags & rdcspv::ImageOperands::Lod)
  params.texel_lod = lane.GetSrc(operands.lod).value.i.x;
  + else
  + params.texel_lod = 0;
  if(operands.flags & rdcspv::ImageOperands::Sample)
  params.sampleIdx = lane.GetSrc(operands.sample).value.u.x;
  