Don't dump duplicate data in stack segments of core dumps when the stack memory map is fragmented.  Avoids ridiculously large core dumps.
Don't dump duplicate data in stack segments of core dumps when the stack
memory map is fragmented.  Avoids ridiculously large core dumps.

ok miod@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars