8342822: jdk8u432-b06 does not compile on AIX

Reviewed-by: andrew, amitkumar

Author: Varada M

hotspot/src/share/vm/opto/superword.hpp

@@ -31,6 +31,10 @@
 #include "opto/vectornode.hpp"
 #include "utilities/growableArray.hpp"
 
+#ifdef AIX
+#include "cstdlib"
+#endif
+
 //
 //                  S U P E R W O R D   T R A N S F O R M
 //