help wrt semantics / primops for pure prefetches

[Carter Schonwald]

Hey Everyone,
in
https://ghc.haskell.org/trac/ghc/ticket/9353
and
https://phabricator.haskell.org/D350

is some preliminary work to fix up how the pure versions of the prefetch
primops work is laid out and prototyped.

However, while it nominally fixes up some of the problems with how the
current pure prefetch apis are fundamentally borken,  the simple design in
D350 isn't quite ideal, and i sketch out some other ideas in the associated
ticket #9353

I'd like to make sure  pure prefetch in 7.10 is slightly less broken than
in 7.8, but either way, its pretty clear that working out the right fixed
up design wont happen till 7.12. Ie, whatever makes 7.10, there WILL have
to be breaking changes to fix those primops for 7.12

thanks and any feedback / thoughts appreciated
-Carter
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