<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64085>64085</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Remove lit feature "reverse_iteration"
        </td>
    </tr>

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

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

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

<pre>
    I added a lit feature `reverse_iteration` to work around two tests when implementing `LLVM_ENABLE_REVERSE_ITERATION` for `StringMap` and changing `StringMap` used hash function from `xxHash64` to `xxh3_64bits`. We can remove the lit feature once the following 2 tests are fixed:

```
% rg ':.*reverse_iteration'
llvm/test/ExecutionEngine/RuntimeDyld/ARM/MachO_ARM_PIC_relocations.s
1:# REQUIRES: reverse_iteration

llvm/test/CodeGen/MIR/AMDGPU/virtreg-uses-unallocatable-class.mir
1:# UNSUPPORTED: reverse_iteration
```

@jayfoad @lhames 
</pre>
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