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24c770ba1c
This is a feature used by LLVM that is enabled for our `aarch64-linux` targets, which we would like to configure on in `std`. Thus, mark `outline-atomics` a known feature. It is left unstable for now.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.