ART: Small class-inl.h cleanup

Remove unnecessary class_linker-inl.h include, and fix up all
transitives (mainly gc_root-inl.h). Also clean up reference.h.

Test: m test-art-host
Change-Id: I47bd6edcfe4a23821e37a6e6fa8cca91d0d2d226
diff --git a/runtime/transaction.cc b/runtime/transaction.cc
index 56ff0a1..907d37e 100644
--- a/runtime/transaction.cc
+++ b/runtime/transaction.cc
@@ -19,8 +19,10 @@
 #include "base/stl_util.h"
 #include "base/logging.h"
 #include "gc/accounting/card_table-inl.h"
+#include "gc_root-inl.h"
 #include "intern_table.h"
 #include "mirror/class-inl.h"
+#include "mirror/dex_cache-inl.h"
 #include "mirror/object-inl.h"
 #include "mirror/object_array-inl.h"