Fix macOS build after enabling Generational CC by default in ART (cont.)

Address more link-time failures when building ART on macOS after
turning on Generational CC collection by default in ART.

Test: mmma art (on macOS and Linux)
Bug: 67628039
Change-Id: I3d630b704f81d570b54dfb53cbd945d0c1a98172
diff --git a/openjdkjvmti/object_tagging.cc b/openjdkjvmti/object_tagging.cc
index ba242ef..1562fb6 100644
--- a/openjdkjvmti/object_tagging.cc
+++ b/openjdkjvmti/object_tagging.cc
@@ -36,6 +36,7 @@
 #include "art_jvmti.h"
 #include "events-inl.h"
 #include "jvmti_weak_table-inl.h"
+#include "mirror/object-inl.h"
 
 namespace openjdkjvmti {
 
diff --git a/openjdkjvmti/ti_monitor.cc b/openjdkjvmti/ti_monitor.cc
index df29098..f71328a 100644
--- a/openjdkjvmti/ti_monitor.cc
+++ b/openjdkjvmti/ti_monitor.cc
@@ -38,6 +38,7 @@
 
 #include "art_jvmti.h"
 #include "gc_root-inl.h"
+#include "mirror/object-inl.h"
 #include "monitor.h"
 #include "runtime.h"
 #include "scoped_thread_state_change-inl.h"