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David Feuer authored
Summary: Make `raiseIO#` produce `topRes` instead of `ExnRes`. `ExnRes` leads to demand analysis being too aggressive, IMO, allowing imprecise exceptions produced by `throw` to replace exceptions thrown by `throwIO` that would like to think of as precise. This fixes that, but is certanly much more conservative than we would ideally like. Let's see how bad it is. Fixes Trac #13380 Reviewers: austin, bgamari Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3301
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