ART: Refactor bit_utils and stl_util

Move iterator code from bit_utils.h into bit_utils_iterator.h. Move
Identity into stl_util_identity.h. Remove now unnecessary includes,
and fix up transitive users.

Test: m
Change-Id: Id1ce9cda66827c5d00584f39ed310b6b37629906
diff --git a/compiler/image_test.h b/compiler/image_test.h
index 394b7f1..026e9e1 100644
--- a/compiler/image_test.h
+++ b/compiler/image_test.h
@@ -26,6 +26,7 @@
 #include "android-base/stringprintf.h"
 
 #include "art_method-inl.h"
+#include "base/stl_util.h"
 #include "base/unix_file/fd_file.h"
 #include "class_linker-inl.h"
 #include "compiler_callbacks.h"