Rename Handler as DiagCtxt.

src/concurrency_limiter.rs

@@ -46,7 +46,7 @@ pub(super) fn new(sess: &Session, pending_jobs: usize) -> Self {
         }
     }
 
-    pub(super) fn acquire(&mut self, handler: &rustc_errors::Handler) -> ConcurrencyLimiterToken {
+    pub(super) fn acquire(&mut self, handler: &rustc_errors::DiagCtxt) -> ConcurrencyLimiterToken {
         let mut state = self.state.lock().unwrap();
         loop {
             state.assert_invariants();