<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/80868>80868</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            tools/llvm-readtapi/stubify-simple.test fails when it is disallowed to write into the input directory
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            llvm-tools
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          ilya-biryukov
      </td>
    </tr>
</table>

<pre>
    We have noticed our tests don't pass with https://github.com/llvm/llvm-project/commit/7189219ec9fc768f159917052b4b5998d077c39f internally.
We have a stricter setup in which we don't allow to write into arbitrary files during test execution.

It turns out that `stubify-simple.test` actually writes into `.tbd` file during its execution and gets "permission denied" error in our setup.

This happens because if uses a path of the `InterfaceFile` to figure out the output path and it can be empty in some cases.
In particular, if I `assert(!IF->getPath().empty())` to [this line](https://github.com/llvm/llvm-project/blob/7189219ec9fc768f159917052b4b5998d077c39f/llvm/tools/llvm-readtapi/llvm-readtapi.cpp#L204), the test fails upstream as well.

@cyndyishida could you please take a look?
</pre>
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