Rewriter removed struct declaration which used in constant buffer.

Hello,
the following shader rewrite with dxr.exe -remove-unused-functions -remove-unused-globals -E vs_main

struct InstanceDataStructType
{
    float4 data;
};

cbuffer InstanceData
{
    InstanceDataStructType mData[2];
};

struct InstanceDataStructTypeNotUsed
{
    float4 data;
};

cbuffer InstanceDataNotUsed
{
    InstanceDataStructType mDataNotUsed[2];
};

struct VS_INPUT
{
    float3 position : POSITION;    
    float4 texcoord0 : TEXCOORD0;
    float4 diffuse: COLOR0;
};

struct VS_OUTPUT
{
    float4 position : SV_Position;
    float4 uv : TEXCOORD0;
    float4 color : VC;
};   
 
VS_OUTPUT vs_main(VS_INPUT input, uint instanceID : SV_InstanceID)
{
    VS_OUTPUT output = (VS_OUTPUT)0;
    output.position += mData[0].data;

    return output;
}

float4 ps_main(VS_OUTPUT input) : SV_Target0 
{
    return input.color;
}

Output's all cbuffer declaration are still remaining, but its referenced struct definitions are removed.

cbuffer InstanceData {
  const InstanceDataStructType mData[2];
}
;
cbuffer InstanceDataNotUsed {
  const InstanceDataStructType mDataNotUsed[2];
}
;
struct VS_OUTPUT {
  float4 position : SV_Position;
  float4 uv : TEXCOORD0;
  float4 color : VC;
};
VS_OUTPUT vs_main(VS_INPUT input, uint instanceID : SV_InstanceID) {
  VS_OUTPUT output = (VS_OUTPUT)0;
  output.position += mData[0].data;
  return output;
}

Reproduce the issue with the supplied HLSL and the dxr.exe command using -remove-unused-functions, -remove-unused-globals, and -E vs_main. Inspect the rewrite handling for constant buffers and struct declarations; done means referenced struct definitions remain valid while genuinely unused declarations may still be removed, with the reported output no longer containing undefined struct types.