<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/91406>91406</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [DirectX] Introduce llvm.dx.handle.fromHeap intrinsic and lowering
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            backend:DirectX
      </td>
    </tr>

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

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

<pre>
    When creating handles for dynamic resources in llvm we'll represent it with a `llvm.dx.handle.fromHeap` intrinsic that creates a target type. There's more information in #90553 but generally this will look something like so:

```llvm
; RWStructuredBuffer<float4> Buf = ResourceDescriptorHeap[2];
%buf = call target("dx.Buffer", <4 x f32>, 1, 0)
            @llvm.dx.handle.fromHeap.tdx.Buffer_v4f32_1_0(
 i32 2, i1 false)
```

This will need to be lowered to `createHandleFromHeap` + `annotateHandle` dxil operations.

## Acceptance Criteria
- The llvm intrinsic and dxil operation are defined
- Emitting dxil will translate the llvm intrinsic to the appropriate dxil ops.
</pre>
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