Move unstable is_{arch}_feature_detected! macros to std::arch
These macros are unstable, except for `is_x86_feature_detected` which is still exported from the crate root for backwards-compatibility.
This should unblock the stabilization of `is_aarch64_feature_detected`.
r? ```@m-ou-se```
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| benches | ||
| primitive_docs | ||
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| build.rs | ||
| Cargo.toml | ||