ART: Remove heap poisoning from globals.h

Remove mostly-unused include and move it to its users.

Test: m
Change-Id: Ibb40f919db64a490290c6e18cf1123aaf44199fc
diff --git a/runtime/mirror/object_reference.h b/runtime/mirror/object_reference.h
index c62ee6c..7fd9c71 100644
--- a/runtime/mirror/object_reference.h
+++ b/runtime/mirror/object_reference.h
@@ -20,6 +20,7 @@
 #include "atomic.h"
 #include "base/mutex.h"  // For Locks::mutator_lock_.
 #include "globals.h"
+#include "heap_poisoning.h"
 #include "obj_ptr.h"
 
 namespace art {