Bump ext/riscv-opcodes from 5ce8977 to 946eb67 (#675)

Bumps [ext/riscv-opcodes](https://github.com/riscv/riscv-opcodes) from
`5ce8977` to `946eb67`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/946eb673874b3a0f2474d1424dc28bc7ee53c306"><code>946eb67</code></a>
Fix file name: smdbltrp -&gt; ssctr (<a
href="https://redirect.github.com/riscv/riscv-opcodes/issues/350">#350</a>)</li>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/d0c4b0b4ef4c56fbd0499b010342b8107585233e"><code>d0c4b0b</code></a>
Remove zimm from arg_lut given that it was substituted by zimm5. (<a
href="https://redirect.github.com/riscv/riscv-opcodes/issues/348">#348</a>)</li>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/9bd0acd77198aa70186ed3e8cc2931bceff97899"><code>9bd0acd</code></a>
Change zimm variable to zimm5, since they were exactly the same. Fixes
<a
href="https://redirect.github.com/riscv/riscv-opcodes/issues/342">#342</a>.
...</li>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/11d830713a073787fb5d3ee893487e112abbfafe"><code>11d8307</code></a>
Add Zvfofp8min draft</li>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/8899b32f218c85bf2559fa95f226bc2533316802"><code>8899b32</code></a>
Add encodings for Zvqdotq instrutions (<a
href="https://redirect.github.com/riscv/riscv-opcodes/issues/337">#337</a>)</li>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/21dab92c834bf782e67034deab87b6bd1952c8ef"><code>21dab92</code></a>
Add menvcfg.cde smcdeleg (<a
href="https://redirect.github.com/riscv/riscv-opcodes/issues/336">#336</a>)</li>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/9f70bcd37db27fddd34b4aa0524b8f19d31e9bb8"><code>9f70bcd</code></a>
add hedelegh and mstateen0_priv113 (<a
href="https://redirect.github.com/riscv/riscv-opcodes/issues/333">#333</a>)</li>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/3c733921341af7f966e9af40570131f5fb4e5d87"><code>3c73392</code></a>
Add CSR encodings for Go and remove call to Go fmt (<a
href="https://redirect.github.com/riscv/riscv-opcodes/issues/329">#329</a>)</li>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/34e1d8194f11f234b073640e970e785e03b6ec04"><code>34e1d81</code></a>
Use argparse for argument parsing (<a
href="https://redirect.github.com/riscv/riscv-opcodes/issues/331">#331</a>)</li>
<li><a
href="https://github.com/riscv/riscv-opcodes/commit/f4aa35e83440fb0b269dc2c0f205f38036d6af02"><code>f4aa35e</code></a>
Sort JSON output (<a
href="https://redirect.github.com/riscv/riscv-opcodes/issues/315">#315</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/riscv/riscv-opcodes/compare/5ce8977a5961a6bbfc1638e6676e60489665d882...946eb673874b3a0f2474d1424dc28bc7ee53c306">compare
view</a></li>
</ul>
</details>
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