Add class loading infrastructure.

Change-Id: I94bdabcefdf1030ee1827d9219eaf60e4dc818ca
diff --git a/src/globals.h b/src/globals.h
index 92d0cf7..1904203 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -3,6 +3,7 @@
 #ifndef ART_SRC_GLOBALS_H_
 #define ART_SRC_GLOBALS_H_
 
+#include <stddef.h>
 #include <stdint.h>
 
 namespace art {