Hey All,

as part of trying to get some fixups for how prefetch works into 7.10,

i'm adding a "prefetchValue" primop that prefetchs the memory location of a lifted heap value 

namely 

several operations of the following form

primop PrefetchValueOp1 "prefetchValue1#" GenPrimOp

   a -> State# s -> State# s

   with strictness  = { \ _arity -> mkClosedStrictSig [botDmd, topDmd] topRes }

I'd like some feedback on the strictness information design by someone who's familiar with how that piece of GHC. the idea being that prefetchValue is lazy in its polymorphic argument (it doesn't force it, it just does a prefetch on the heap location, which may or may not be evaluated).

https://phabricator.haskell.org/D350

is the code in question. And i *believe* i'm testing for being lazy in that argument correctly.

thoughts?

many thanks!

-Carter

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