Fix some typos.

cranelift/src/filetest/concurrent.rs

@@ -119,7 +119,7 @@ fn worker_thread(
             loop {
                 // Lock the mutex only long enough to extract a request.
                 let Request(jobid, path) = match requests.lock().unwrap().recv() {
-                    Err(..) => break, // TX end shuit down. exit thread.
+                    Err(..) => break, // TX end shut down. exit thread.
                     Ok(req) => req,
                 };
 

cranelift/src/filetest/runner.rs

@@ -221,7 +221,7 @@ impl TestRunner {
         }
         self.tests[jobid].state = State::Done(result);
 
-        // Rports jobs in order.
+        // Reports jobs in order.
         while self.report_job() {
             self.reported_tests += 1;
         }