Change thread.h to thread-inl.h to pick up missing Thread::Currnet for debug build in master

Change-Id: I56a4dd18ec1c212f9dbb73b14c0c0623b23c87bd
diff --git a/runtime/well_known_classes.cc b/runtime/well_known_classes.cc
index 8de020a..e3946f7 100644
--- a/runtime/well_known_classes.cc
+++ b/runtime/well_known_classes.cc
@@ -21,7 +21,7 @@
 #include "base/logging.h"
 #include "mirror/class.h"
 #include "ScopedLocalRef.h"
-#include "thread.h"
+#include "thread-inl.h"
 
 namespace art {