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/class_linker-inl.h b/runtime/class_linker-inl.h
index 21b63c6..11901b3 100644
--- a/runtime/class_linker-inl.h
+++ b/runtime/class_linker-inl.h
@@ -187,7 +187,7 @@
 }
 
 inline mirror::Class* ClassLinker::GetClassRoot(ClassRoot class_root)
-    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    SHARED_REQUIRES(Locks::mutator_lock_) {
   DCHECK(!class_roots_.IsNull());
   mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read();
   mirror::Class* klass = class_roots->Get(class_root);