ART: Fix up small header includes

Test: m
Change-Id: I6978d6eb4b95a6ee810e5a48ca6f5d6c590d4ce1
diff --git a/compiler/optimizing/intrinsics_mips.cc b/compiler/optimizing/intrinsics_mips.cc
index 4cea6df..2669d97 100644
--- a/compiler/optimizing/intrinsics_mips.cc
+++ b/compiler/optimizing/intrinsics_mips.cc
@@ -22,6 +22,7 @@
 #include "entrypoints/quick/quick_entrypoints.h"
 #include "intrinsics.h"
 #include "mirror/array-inl.h"
+#include "mirror/object_array-inl.h"
 #include "mirror/string.h"
 #include "scoped_thread_state_change-inl.h"
 #include "thread.h"