Defines starting with `r' in osfmk/ppc

• REG_DATAADDR osfmk/ppc/net_filter.c:34
• REG_DATALEN osfmk/ppc/net_filter.c:35
• REG_HDRADDR osfmk/ppc/net_filter.c:36
• REG_RET osfmk/ppc/net_filter.c:37
• REG_ZERO osfmk/ppc/net_filter.c:33
• RESET_HANDLER_NULL osfmk/ppc/exception.h:506
• RESET_HANDLER_START osfmk/ppc/exception.h:507
• riseg osfmk/ppc/asm.h:171
• risegm osfmk/ppc/asm.h:172
• rpa osfmk/ppc/asm.h:131
• rtcl osfmk/ppc/asm.h:55
• RTC_TICKPERIOD osfmk/ppc/rtclock.c:142
• rtcu osfmk/ppc/asm.h:54
• RUPTTRC osfmk/ppc/lowmem_vectors.s:67