Segmentation fault in async recursion
To reproduce:
```
use std::future::Future;
#[inline(never)]
async fn recurse(n: usize) {
let x = [77u8; 70000];
if n != 0 {
std::future::poll_fn(move |cx| {
stacker::maybe_grow(140 * 1024, 8 * 1024, move || {
Box::pin(recurse(n - 1)).as_mut().poll(cx)
})
})
.await;
}
#[allow(dropping_copy_types)]
drop(x);
}
#[test]
fn foof() {
futures_lite::future::block_on(recurse(10000))
}
```
Error message:
```
process didn't exit successfully: `/home/dullbananas/Dropbox/stacker/target/debug/deps/segfault-6753b3a3d075b2b5 foof --exact --show-output` (signal: 11, SIGSEGV: invalid memory reference)
```
cargo 1.86.0 (adf9b6ad1 2025-02-28)
Linux 6.14.5-300.t2.fc42.x86_64
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