ART: Refactor verify_object.h

Move the actual VerifyObject check into a new cc file, as we
commonly don't enable the check at all. This allows to cut the
-inl include from almost all current users.

This also exposes missing -inl includes. Also fix up some of our old
mess where .h defined functions require -inl.h defined functions.

Test: m

Change-Id: I3dd821bbe2015564a29bf1ed9be00f7a7276ad61
diff --git a/runtime/gc/heap.cc b/runtime/gc/heap.cc
index aa15714..fc475b5 100644
--- a/runtime/gc/heap.cc
+++ b/runtime/gc/heap.cc
@@ -78,6 +78,7 @@
 #include "scoped_thread_state_change-inl.h"
 #include "handle_scope-inl.h"
 #include "thread_list.h"
+#include "verify_object-inl.h"
 #include "well_known_classes.h"
 
 namespace art {