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.h b/compiler/optimizing/code_generator.h
index 7031483..a487320 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -24,6 +24,8 @@
 #include "base/bit_field.h"
 #include "base/bit_utils.h"
 #include "base/enums.h"
+#include "dex/string_reference.h"
+#include "dex/type_reference.h"
 #include "globals.h"
 #include "graph_visualizer.h"
 #include "locations.h"
@@ -33,8 +35,6 @@
 #include "read_barrier_option.h"
 #include "stack.h"
 #include "stack_map.h"
-#include "string_reference.h"
-#include "type_reference.h"
 #include "utils/label.h"
 
 namespace art {