Clean up ScopedThreadStateChange to use ObjPtr

Also fixed inclusion of -inl.h files in .h files by adding
scoped_object_access-inl.h and scoped_fast_natvie_object_access-inl.h

Changed AddLocalReference / Decode to use ObjPtr.

Changed libartbenchmark to be debug to avoid linkage errors.

Bug: 31113334

Test: test-art-host

Change-Id: I4d2e160483a29d21e1e0e440585ed328b9811483
diff --git a/runtime/monitor_test.cc b/runtime/monitor_test.cc
index ac6a4f3..4ee46dc 100644
--- a/runtime/monitor_test.cc
+++ b/runtime/monitor_test.cc
@@ -27,7 +27,7 @@
 #include "mirror/class-inl.h"
 #include "mirror/string-inl.h"  // Strings are easiest to allocate
 #include "object_lock.h"
-#include "scoped_thread_state_change.h"
+#include "scoped_thread_state_change-inl.h"
 #include "thread_pool.h"
 
 namespace art {