unimplemented instrinsic in `hyper` (`_mm256_lddqu_si256`)

[y21]

Noticed this in a project using reqwest, but it also seems to reproduce using just hyper and tokio:

# Cargo.toml
[package]
name = "repro"
version = "0.1.0"
edition = "2021"

[dependencies]
hyper = { version = "0.14.27", features = ["client", "http1", "tcp"] }
tokio = { version = "1.33.0", features = ["full"] }

// main.rs
#[tokio::main]
async fn main() {
    let client = hyper::Client::new();
    client
        .request(
            hyper::Request::builder()
                .uri("http://httpbin.org/get")
                .body(hyper::Body::empty())
                .unwrap(),
        )
        .await
        .unwrap();
}

trap at Instance { def: Item(DefId(2:14310 ~ core[53bd]::core_arch::x86::avx::_mm256_lddqu_si256)), args: [] } (_ZN4core9core_arch3x863avx18_mm256_lddqu_si25617h4bd75b5668ffeef1E): llvm.x86.avx.ldu.dq.256

Awesome project btw! It's great to see that this is available as a rustup component now

[bjorn3]

Turns out cg_clif miscompiled is_x86_feature_detected!() such that AVX is never detected: #1405 (comment) This has resulted in me not noticing all the AVX intrinsics that crates rely on. When using the rustup component, an LLVM compiled libstd will be used which has a correct is_x86_feature_detected!() which does detect AVX. I will work on implementing this AVX vendor intrinsic tomorrow.

[bjorn3]

Should be fixed in the latest nightly.