Revert "Make raiseIO# produce topRes"
This reverts commit da4687f6. It's not entirely trivial to clean up the dead code this patch introduced. In particular, when we see ``` case raiseIO# m s of s' -> e ``` we want to know that `e` is dead. For scrutinees that are properly bottom (which we don't want to consider `raiseIO# m s` to be, this is handled by rewriting `bot` to `case bot of {}`. But if we do that for `raiseIO#`, we end up with ``` case raiseIO# m s of {} ``` which looks a lot like bottom and could confuse demand analysis. I think we need to wait with this change until we have a more complete story. Reviewers: austin, bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3413 (cherry picked from commit e83af07e)
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