Rollup merge of #138084 - nnethercote:workspace-lints, r=jieyouxu

Use workspace lints for crates in `compiler/`

This is nicer and hopefully less error prone than specifying lints via bootstrap.

r? ``@jieyouxu``

compiler/rustc_middle/Cargo.toml

@@ -42,3 +42,6 @@ tracing = "0.1"
 # tidy-alphabetical-start
 rustc_randomized_layouts = []
 # tidy-alphabetical-end
+
+[lints]
+workspace = true

compiler/rustc_middle/src/lib.rs

@@ -61,7 +61,6 @@
 #![feature(try_trait_v2_yeet)]
 #![feature(type_alias_impl_trait)]
 #![feature(yeet_expr)]
-#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 #[cfg(test)]