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/gc/collector/concurrent_copying.cc b/runtime/gc/collector/concurrent_copying.cc
index 792c191..46c9c0e 100644
--- a/runtime/gc/collector/concurrent_copying.cc
+++ b/runtime/gc/collector/concurrent_copying.cc
@@ -33,6 +33,7 @@
 #include "intern_table.h"
 #include "mirror/class-inl.h"
 #include "mirror/object-inl.h"
+#include "mirror/object-refvisitor-inl.h"
 #include "scoped_thread_state_change-inl.h"
 #include "thread-inl.h"
 #include "thread_list.h"