avoid introducing xv6-style u32 type in refcache.hh
avoid introducing xv6-style u32 type in refcache.hh

bowlofstew/sv6,aclements/sv6,aclements/sv6,bowlofstew/sv6,aclements/sv6,bowlofstew/sv6,aclements/sv6,bowlofstew/sv6,aclements/sv6,bowlofstew/sv6