<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/98979>98979</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            MC option should not appear in the list of `opt --help`
        </td>
    </tr>

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

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

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

<pre>
    Now we can see
```
--x86-relax-relocations
--x86-sse2avx 
--x86-align-branch=<string>
--x86-align-branch-boundary=<uint>
--x86-branches-within-32B-boundaries
```
in the result of `opt --help`.

It's confusing b/c these options should be MC only and won't take effect when we pass them to `opt`.

@MaskRay 
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJx0Uk1vpDAM_TXhYjHKhAkMhxz6sUirVffQf5AEA9lmEhSH0vn3K-hUW1VdCRklfs9-ebYmcmNAVEzeM_lY6CVPMalfOjxHgykXJvZX9TuusCJYHYAQGX9k_I7V_Pbtx7J8O9dlQq_fthitzi4G-pwkQqFf3-DznfZuDKVJOtiJVY-seqCcXBhZ9eN_sNLEJfQ6Xd_xiwv5C_odh1SuLk8ulJW4_yA5pG_luwB5QkhIi88QB2A1j3OGspzQz6zmhxttjz8zEw2BjWFYyIURDBOd3SoQQpz3lwNNcfE9GISnB4jBX0GHHtYYmGgyZP2CgMOANsM6Ydj8nTXRVuQCOd4EfO3MTvxJ08uzvkLRq6pvq1YXqI6NOPJWtidZTOpUN1I050Yfa7RoZT1IW3Euq9acjea2cEpwceLNsebiKIQ8SFmb9tj2KBs7mL5nJ44X7fzB-9fLIaaxcEQLqvbcNm3htUFP-8YIEXCFPcmE2BYoqY1TmmUkduLeUaZ_VbLLHtVmx-7Rh0UhZtDzjDrBbQ4b77spFEvyasp5JlbdMdEx0Y0uT4s52Hhhots63X7lnOIftJmJbtdHTHTv-l-V-BsAAP__u-jrTQ">