Fix setproctitle related crashes. (#8150)
Fix setproctitle related crashes. (#8150)

Makes spt_init more careful with assumptions about what memory regions
may be overwritten. It will now only consider a contiguous block of argv
and envp elements and mind any gaps.
JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis