Rollup merge of #77739 - est31:remove_unused_code, r=petrochenkov,varkor

Remove unused code

Rustc has a builtin lint for detecting unused code inside a crate, but when an item is marked `pub`, the code, even if unused inside the entire workspace, is never marked as such. Therefore, I've built [warnalyzer](https://github.com/est31/warnalyzer) to detect unused items in a cross-crate setting.

Closes https://github.com/est31/warnalyzer/issues/2

compiler/rustc_codegen_ssa/src/back/write.rs

@@ -1519,8 +1519,6 @@ fn start_executing_work<B: ExtraBackendMethods>(
     }
 }
 
-pub const CODEGEN_WORKER_ID: usize = usize::MAX;
-
 /// `FatalError` is explicitly not `Send`.
 #[must_use]
 pub struct WorkerFatalError;

compiler/rustc_codegen_ssa/src/base.rs

@@ -479,8 +479,6 @@ fn get_argc_argv<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     }
 }
 
-pub const CODEGEN_WORKER_ID: usize = usize::MAX;
-
 pub fn codegen_crate<B: ExtraBackendMethods>(
     backend: B,
     tcx: TyCtxt<'tcx>,