Revert "Revert "Make clang the default compiler on host.""

This reverts commit d54f3a6219bca6ae018f4395fa0f1254bd4459be.

Change-Id: Id96bb52a0d599f8848010d1589bdf0f70fc7124b
diff --git a/runtime/thread_list.h b/runtime/thread_list.h
index 58bd92a..a574340 100644
--- a/runtime/thread_list.h
+++ b/runtime/thread_list.h
@@ -90,9 +90,8 @@
       LOCKS_EXCLUDED(Locks::thread_list_lock_,
                      Locks::thread_suspend_count_lock_);
 
-  size_t RunCheckpointOnRunnableThreads(Closure* checkpoint_function);
-      LOCKS_EXCLUDED(Locks::thread_list_lock_,
-                 Locks::thread_suspend_count_lock_);
+  size_t RunCheckpointOnRunnableThreads(Closure* checkpoint_function)
+      LOCKS_EXCLUDED(Locks::thread_list_lock_, Locks::thread_suspend_count_lock_);
 
   // Suspends all threads
   void SuspendAllForDebugger()