Auto merge of #43247 - est31:master, r=alexcrichton
Tidy: allow common lang+lib features This allows changes to the Rust language that have both library and language components share one feature gate. The feature gates need to be "about the same change", so that both library and language components must either be both unstable, or both stable, and share the tracking issue. Removes the ugly "proc_macro" exception added by #40939. Closes #43089
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