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_arm_vixl.h b/compiler/optimizing/code_generator_arm_vixl.h
index 2d8f6a6..6a07e36 100644
--- a/compiler/optimizing/code_generator_arm_vixl.h
+++ b/compiler/optimizing/code_generator_arm_vixl.h
@@ -20,11 +20,11 @@
 #include "base/enums.h"
 #include "code_generator.h"
 #include "common_arm.h"
+#include "dex/string_reference.h"
+#include "dex/type_reference.h"
 #include "driver/compiler_options.h"
 #include "nodes.h"
 #include "parallel_move_resolver.h"
-#include "string_reference.h"
-#include "type_reference.h"
 #include "utils/arm/assembler_arm_vixl.h"
 
 // TODO(VIXL): make vixl clean wrt -Wshadow.