ART: Forward declarations for InvokeType

Use forward declarations in other header files.

Test: m
Change-Id: I8ef4492b6c48ff20d4d77d0516eacd362ed210bc
diff --git a/runtime/mirror/class-inl.h b/runtime/mirror/class-inl.h
index 67aeeff..77a5b55 100644
--- a/runtime/mirror/class-inl.h
+++ b/runtime/mirror/class-inl.h
@@ -30,6 +30,7 @@
 #include "dex_file-inl.h"
 #include "gc/heap-inl.h"
 #include "iftable.h"
+#include "invoke_type.h"
 #include "object-inl.h"
 #include "object_array.h"
 #include "read_barrier-inl.h"