Move some remaining dex utilities

There were several utilities related to building/walking/testing dex
files that were not in libdexfile.  This change consolidates these.

Bug: 22322814
Test: make -j 50 test-art-host
Change-Id: Id76e9179d03b8ec7d67f7e0f267121f54f0ec2e0
diff --git a/dex2oat/dex2oat_test.cc b/dex2oat/dex2oat_test.cc
index 09ff14e..5590c8b 100644
--- a/dex2oat/dex2oat_test.cc
+++ b/dex2oat/dex2oat_test.cc
@@ -30,9 +30,9 @@
 #include "base/macros.h"
 #include "base/mutex-inl.h"
 #include "base/utils.h"
-#include "bytecode_utils.h"
 #include "dex/art_dex_file_loader.h"
 #include "dex/base64_test_util.h"
+#include "dex/bytecode_utils.h"
 #include "dex/code_item_accessors-inl.h"
 #include "dex/dex_file-inl.h"
 #include "dex/dex_file_loader.h"