ART: Do some include-what-you-use

Help with transitive includes. In preparation for new
specialized headers reducing transitivity.

Bug: 118385392
Test: mmma art
Change-Id: Ib465ecceec3331ea81588fb4a43eb65e766b6904
diff --git a/runtime/class_table-inl.h b/runtime/class_table-inl.h
index 6b6fe34..a2cdb2c 100644
--- a/runtime/class_table-inl.h
+++ b/runtime/class_table-inl.h
@@ -19,6 +19,7 @@
 
 #include "class_table.h"
 
+#include "base/mutex-inl.h"
 #include "gc_root-inl.h"
 #include "mirror/class.h"
 #include "oat_file.h"