<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/96129>96129</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [CodeGen] refactor getDwarfRegNum()
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          chenzheng1030
      </td>
    </tr>
</table>

<pre>
    This is from code review of https://github.com/llvm/llvm-project/pull/95837#discussion_r1643647221

We should use the `getDwarfRegNum()` defined in `MCRegisterInfo.h` instead of defining a new one in [llvm/lib/CodeGen/StackMaps.cpp](https://github.com/llvm/llvm-project/pull/95837/files/35667789a4ca64173b0240a37a8e85c1a426c2e9#diff-2634df2e1fb79253f14db36043207f9ef3d719222e63e0508ea67b3caf9d9064)

The DwarfRegAlias may not be needed if we implement the `getDwarfRegNum()` by sharing the DWARF reg numbers among sub/supper registers.
</pre>
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