ensure RET assignments do not get propagated on unwinding

Mostly this adds a test for rust-lang/unsafe-code-guidelines#468, and then also some other related tests I thought of while writing that test.

Implement `llvm.x86.aesni.*` intrinsics

avoid confusing loop in catch_panic test

Fixes rust-lang/miri#3115

Rustup

Automatic sync from rustc

…Jung

Implement `llvm.x86.sse41.*` intrinsics

triagebot: re-enable merge commit check

rust-lang/triagebot#1720 has landed.

Also make the keyword "Rustup", which is what we've been already using for such PRs for a while. Just adjust the bot to also put that in the title.

Automatic Rustup

Now it masks out the correct bit and adds some explanatory comments. Also extends the tests.

Fix rounding mode check in SSE4.1 round functions

Now it masks out the correct bit and adds some explanatory comments. Also extends the tests.

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….19, r=RalfJung

Bump rustix from 0.38.17 to 0.38.19

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Bump rustix from 0.38.17 to 0.38.19 in /cargo-miri

Bumps [rustix](https://github.com/bytecodealliance/rustix) from 0.38.17 to 0.38.19.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/bytecodealliance/rustix/commit/3a53dfe16cddc39fd20ecfb07c7d78880cb3880a"><code>3a53dfe</code></a> chore: Release rustix version 0.38.19</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/55cbe8839c8a78896b7f1e5310b3bcf20f8b0ac5"><code>55cbe88</code></a> Fixes for <code>Dir</code> on macOS, FreeBSD, and WASI.</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/31fd98ca723b93cc6101a3e29843ea5cf094e159"><code>31fd98c</code></a> Merge pull request from GHSA-c827-hfw6-qwvm</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/4bb2f4bbcd3a482112aadb4a226e0fce21fe5d8c"><code>4bb2f4b</code></a> Add <code>mlockall</code> and <code>munlockall</code> (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/872">#872</a>)</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/d012bcf8967ba518bfa5a05d2c166139f4d4a9a0"><code>d012bcf</code></a> Fixes needed by io_uring. (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/873">#873</a>)</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/5e5c0460cc576af9798f542a96ef6abb780b1ba1"><code>5e5c046</code></a> Add a test for <code>get_socket_nosigpipe</code>. (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/874">#874</a>)</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/1a9d12963d49fda5347b622ee814e2e017fe7444"><code>1a9d129</code></a> chore: Release rustix version 0.38.18</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/112c268cd79438caae20a0bd4560ada5a1565450"><code>112c268</code></a> io-uring API updates. (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/871">#871</a>)</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/0c227041a7faced80a532966dc085961fb46073a"><code>0c22704</code></a> Provide {get,set}_socket_nosigpipe on NetBSD and DragonFly BSD (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/870">#870</a>)</li>
<li>See full diff in <a href="https://github.com/bytecodealliance/rustix/compare/v0.38.17...v0.38.19">compare view</a></li>
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---
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Signed-off-by: dependabot[bot] <support@github.com>

…/rustix-0.38.19, r=RalfJung

Bump rustix from 0.38.17 to 0.38.19 in /miri-script

Bumps [rustix](https://github.com/bytecodealliance/rustix) from 0.38.17 to 0.38.19.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/bytecodealliance/rustix/commit/3a53dfe16cddc39fd20ecfb07c7d78880cb3880a"><code>3a53dfe</code></a> chore: Release rustix version 0.38.19</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/55cbe8839c8a78896b7f1e5310b3bcf20f8b0ac5"><code>55cbe88</code></a> Fixes for <code>Dir</code> on macOS, FreeBSD, and WASI.</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/31fd98ca723b93cc6101a3e29843ea5cf094e159"><code>31fd98c</code></a> Merge pull request from GHSA-c827-hfw6-qwvm</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/4bb2f4bbcd3a482112aadb4a226e0fce21fe5d8c"><code>4bb2f4b</code></a> Add <code>mlockall</code> and <code>munlockall</code> (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/872">#872</a>)</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/d012bcf8967ba518bfa5a05d2c166139f4d4a9a0"><code>d012bcf</code></a> Fixes needed by io_uring. (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/873">#873</a>)</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/5e5c0460cc576af9798f542a96ef6abb780b1ba1"><code>5e5c046</code></a> Add a test for <code>get_socket_nosigpipe</code>. (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/874">#874</a>)</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/1a9d12963d49fda5347b622ee814e2e017fe7444"><code>1a9d129</code></a> chore: Release rustix version 0.38.18</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/112c268cd79438caae20a0bd4560ada5a1565450"><code>112c268</code></a> io-uring API updates. (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/871">#871</a>)</li>
<li><a href="https://github.com/bytecodealliance/rustix/commit/0c227041a7faced80a532966dc085961fb46073a"><code>0c22704</code></a> Provide {get,set}_socket_nosigpipe on NetBSD and DragonFly BSD (<a href="https://redirect.github.com/bytecodealliance/rustix/issues/870">#870</a>)</li>
<li>See full diff in <a href="https://github.com/bytecodealliance/rustix/compare/v0.38.17...v0.38.19">compare view</a></li>
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Rustup

…ting the base address

intptrcast: remove information about dead allocations

The discussion in rust-lang/miri#3103 convinced me we don't have to keep `int_to_ptr_map` around for dead allocations. But we should not make that depend on the GC, we can just tie it to when the allocation gets freed. That means everything still behaves deterministically, if anything weird happens (but it shouldn't).

r? `@saethlin`
Only the first and last commit contain logic changes, the 2nd commit just moves code around a bit.

Rustup

Also fix josh build (they have a `deny(warnings)` that's causing issues).

Automatic Rustup