ART: Some header cleaning around bit-utils

Try to remove dependencies where they are not necessary.

Change-Id: I5ff35cb17aea369bed3725b1610b50d7eb05b81e
diff --git a/runtime/dex_file.cc b/runtime/dex_file.cc
index d30fac4..52590a5 100644
--- a/runtime/dex_file.cc
+++ b/runtime/dex_file.cc
@@ -29,6 +29,7 @@
 
 #include "art_field-inl.h"
 #include "art_method-inl.h"
+#include "base/hash_map.h"
 #include "base/logging.h"
 #include "base/stringprintf.h"
 #include "class_linker.h"