Auto merge of #121909 - Zoxc:drop-ast-task, r=petrochenkov

Drop AST on a separate thread and prefetch `hir_crate`

This drop AST on a separate thread and prefetches `hir_crate`.

A `spawn` function is added to the `parallel` module which spawn some work on the Rayon thread pool.

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/rustc_data_structures/src/sync.rs b/compiler/rustc_data_structures/src/sync.rs
index 616a18a72ab..80d49effbf8 100644
--- a/compiler/rustc_data_structures/src/sync.rs
+++ b/compiler/rustc_data_structures/src/sync.rs
@@ -43,7 +43,7 @@ pub use self::freeze::{FreezeLock, FreezeReadGuard, FreezeWriteGuard};
 pub use self::lock::{Lock, LockGuard, Mode};
 pub use self::mode::{is_dyn_thread_safe, set_dyn_thread_safe_mode};
 pub use self::parallel::{
-    join, par_for_each_in, par_map, parallel_guard, scope, try_par_for_each_in,
+    join, par_for_each_in, par_map, parallel_guard, scope, spawn, try_par_for_each_in,
 };
 pub use self::vec::{AppendOnlyIndexVec, AppendOnlyVec};
 pub use self::worker_local::{Registry, WorkerLocal};