<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/112777>112777</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [HLSL] Add `AppendStructuredBuffer` and `ConsumeStructuredBuffer` definitions to HLSLExternalSemaSource
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          hekota
      </td>
    </tr>
</table>

<pre>
    Add `AppendStructuredBuffer` and `ConsumeStructuredBuffer` definitions to HLSLExternalSemaSource. 

`AppendStructuredBuffer` is a streaming output buffer:
https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/sm5-object-appendstructuredbuffer

`ConsumeStructuredBuffer` is a streaming input buffer: 
https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/sm5-object-consumestructuredbuffer

The resource definitions will contain a handle that will be lowered to a `dx.RawBuffer` target extension type with the UDT as its type argument.

Refer to [Proposal for mapping resource attributes](https://github.com/llvm/wg-hlsl/pull/76) for the attribute mapping.
</pre>
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