Move/rename lazy::{OnceCell, Lazy} to cell::{OnceCell, LazyCell}

compiler/rustc_error_messages/src/lib.rs

@@ -18,7 +18,7 @@ use std::path::{Path, PathBuf};
 use tracing::{instrument, trace};
 
 #[cfg(not(parallel_compiler))]
-use std::lazy::Lazy;
+use std::cell::LazyCell as Lazy;
 #[cfg(parallel_compiler)]
 use std::lazy::SyncLazy as Lazy;