CoW Barrier#1

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jamatthews wants to merge 3 commits intotrunkfrom

Commits on Mar 23, 2017

add a barrier to pages to prevent child processes from trying to write into empty slots on CoW shared pages
Jacob Matthews
committed

Commits on Jan 16, 2018

add more functionality to freezing
jamatthews
committed

Commits on Jan 17, 2018

try to break the GC a little less
jamatthews
committed