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/compiler/optimizing/code_generator.cc b/compiler/optimizing/code_generator.cc
index 0fcc9c6..c2ae764 100644
--- a/compiler/optimizing/code_generator.cc
+++ b/compiler/optimizing/code_generator.cc
@@ -44,9 +44,9 @@
 #include "base/bit_utils_iterator.h"
 #include "base/casts.h"
 #include "base/leb128.h"
-#include "bytecode_utils.h"
 #include "class_linker.h"
 #include "compiled_method.h"
+#include "dex/bytecode_utils.h"
 #include "dex/code_item_accessors-inl.h"
 #include "dex/verified_method.h"
 #include "driver/compiler_driver.h"