I tried to build an example project for wasm64-unknown-unknown with target-feature=+atomics, but the std failed to build due to

I could get std to build by adding #![feature(simd_wasm64)] to https://github.com/rust-lang/rust/blob/master/library/std/src/lib.rs, and a few cfg checks to import the correct module.

I could work on a PR if that's the right approach.

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rustc --version --verbose:

rustc 1.81.0-nightly (d7f6ebace 2024-06-16) binary: rustc commit-hash: d7f6ebacee13b6c03623c4b74197280454ede8de commit-date: 2024-06-16 host: aarch64-apple-darwin release: 1.81.0-nightly LLVM version: 18.1.7