Rollup merge of rust-lang#120976 - matthiaskrgr:constify_TL_statics, r=lcnr

constify a couple thread_local statics

Author: matthiaskrgr

proc_macro/src/bridge/client.rs

@@ -209,7 +209,7 @@ impl<'a> scoped_cell::ApplyL<'a> for BridgeStateL {
 
 thread_local! {
     static BRIDGE_STATE: scoped_cell::ScopedCell<BridgeStateL> =
-        scoped_cell::ScopedCell::new(BridgeState::NotConnected);
+        const { scoped_cell::ScopedCell::new(BridgeState::NotConnected) };
 }
 
 impl BridgeState<'_> {

proc_macro/src/bridge/server.rs

@@ -223,7 +223,7 @@ thread_local! {
     /// This is required as the thread-local state in the proc_macro client does
     /// not handle being re-entered, and will invalidate all `Symbol`s when
     /// entering a nested macro.
-    static ALREADY_RUNNING_SAME_THREAD: Cell<bool> = Cell::new(false);
+    static ALREADY_RUNNING_SAME_THREAD: Cell<bool> = const { Cell::new(false) };
 }
 
 /// Keep `ALREADY_RUNNING_SAME_THREAD` (see also its documentation)