<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/150567>150567</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            llvm-objdump --mcpu=help doesn't work without an input file
        </td>
    </tr>

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

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

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

<pre>
    ```
$ llvm-objdump --version
Fuchsia LLVM version 21.0.0git
...
```

`--help` indicates that `--mcpu=help` should provide details for the `--mcpu` option:
```
$ llvm-objdump --help
OVERVIEW: llvm object file dumper

USAGE: llvm-objdump [options] <input object files>

OPTIONS:
  ...
  --mcpu=cpu-name         Target a specific cpu type (--mcpu=help for details) 
  ...
```

If I do only that, it just outputs the normal help again:
```
$ llvm-objdump --mcpu=help
OVERVIEW: llvm object file dumper

...
```

But if I provide it an input file, then it provides the CPU help:
```
$ llvm-objdump --mcpu=help -d a.out >/dev/null
Available CPUs for this target:

 arm1020e       - Select the arm1020e processor.
  ...
```

It seems like `--mcpu=help` should bypass the rest of the argument checking.
</pre>
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