Included size_t for hpvm.h

hpvm/test/include/hpvm.h

@@ -11,6 +11,11 @@
 #endif
 
 #include "../../include/SupportHPVM/HPVMHint.h"
+#ifdef __cplusplus
+#include <cstddef>
+#else
+#include <stddef.h>
+#endif
 
 #ifndef __cplusplus
 #define noexcept