Move to newer clang annotations

Also enable -Wthread-safety-negative.

Changes:
Switch to capabilities and negative capabilities.

Future work:
Use capabilities to implement uninterruptible annotations to work
with AssertNoThreadSuspension.

Bug: 20072211

Change-Id: I42fcbe0300d98a831c89d1eff3ecd5a7e99ebf33
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index cc8b215..c92f08f 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -590,7 +590,7 @@
   return true;
 }
 
-void Runtime::EndThreadBirth() EXCLUSIVE_LOCKS_REQUIRED(Locks::runtime_shutdown_lock_) {
+void Runtime::EndThreadBirth() REQUIRES(Locks::runtime_shutdown_lock_) {
   DCHECK_GT(threads_being_born_, 0U);
   threads_being_born_--;
   if (shutting_down_started_ && threads_being_born_ == 0) {