LLVM ERROR: "Vector elements must have same size" with -Zmir-opt-level=3

### Code

You may need a debug-assertions build of llvm to reproduce this.
Interestingly this only triggers with mir-opt-level `3` but not with `2`.

```Rust
#[derive(Clone)]
pub struct Foo(Bar, u32);

#[derive(Clone, Copy)]
pub struct Bar(u8, u8, u8);

fn main() {
    let foo: Vec<Foo> = Vec::new();
    let _ = foo.clone();
}
```


### Meta


`rustc --version --verbose`:
```
rustc @ 371100b1fb811e604f7451eff3b06960587fe1af with full rustc + llvm debug assertions
```

### Error output
`rustc  -Copt-level=3 103380.rs`
```
rustc: /home/matthias/vcs/github/rust_debug_assertions/src/llvm-project/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp:2907: llvm::Value *llvm::InnerLoopVectorizer::createBitOrPointerCast(llvm::Value *, llvm::VectorType *, const llvm::DataLayout &): Assertion `(DL.getTypeSizeInBits(SrcElemTy) == DL.getTypeSizeInBits(DstElemTy)) && "Vector elements must have same size"' failed.
```


<details><summary><strong>Backtrace</strong></summary>
<p>

```
rustc: /home/matthias/vcs/github/rust_debug_assertions/src/llvm-project/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp:2907: llvm::Value *llvm::InnerLoopVectorizer::createBitOrPointerCast(llvm::Value *, llvm::VectorType *, const llvm::DataLayout &): Assertion `(DL.getTypeSizeInBits(SrcElemTy) == DL.getTypeSizeInBits(DstElemTy)) && "Vector elements must have same size"' failed.
```

</p>
</details>

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LLVM ERROR: "Vector elements must have same size" with -Zmir-opt-level=3 #104037

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Uh oh!

LLVM ERROR: "Vector elements must have same size" with -Zmir-opt-level=3 #104037

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