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Demote x86_64-apple-darwin to Tier 2 with host tools Switch to only using aarch64 runners (implying we are now cross-compiling) and stop running tests. In the future, we could enable (some?) tests via Rosetta 2. This implements the decision from https://github.com/rust-lang/rfcs/pull/3841.
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.