dll-split

[Ryan Scott]

Thanks for putting so much effort into this work, Tamar!

> When I do turn it on, by default you will get a large ~45min hit in compile time.

Yikes, that's really bad! Bad enough that I have to wonder: would it
be worth including genlib among the other executables that we bundle
with GHC? Fortunately, us GHC developers have the foresight to know
that we should install genlib, but I imagine less informed Windows
users probably won't get the memo and will start to wonder why
compilation became so slow all of a sudden.

Ryan S.