Add dexlayout support for call sites and method handles.

Tested that it works with Orion's test dex files. Can generate output
files that match the test input files.

Unit tests to follow.

Bug: 37732062
Test: mm test-art-host
Change-Id: Icb76cf858d29e52022f98ac625bd35c3bd763e9f
diff --git a/dexlayout/dex_writer.h b/dexlayout/dex_writer.h
index fb76e5c..b396adf 100644
--- a/dexlayout/dex_writer.h
+++ b/dexlayout/dex_writer.h
@@ -59,6 +59,8 @@
   void WriteDebugInfoItems();
   void WriteCodeItems();
   void WriteClasses();
+  void WriteCallSites();
+  void WriteMethodHandles();
   void WriteMapItem();
   void WriteHeader();