ART: Clean up art_method.h

Clean up the header. Fix up other headers including the -inl file,
in an effort to prune the include graph. Fix broken transitive
includes by making includes explicit. Introduce new -inl files
for method handles and reference visiting.

Test: source build/envsetup.sh && lunch aosp_angler-userdebug && mmma art
Test: source build/envsetup.sh && lunch aosp_mips64-userdebug && mmma art
Change-Id: I8f60f1160c2a702fdf3598149dae38f6fa6bc851
diff --git a/runtime/mirror/class.cc b/runtime/mirror/class.cc
index 26af488..06ee3d3 100644
--- a/runtime/mirror/class.cc
+++ b/runtime/mirror/class.cc
@@ -32,6 +32,7 @@
 #include "method.h"
 #include "object_array-inl.h"
 #include "object-inl.h"
+#include "object-refvisitor-inl.h"
 #include "object_lock.h"
 #include "runtime.h"
 #include "thread.h"