Preserve precise exceptions in strictness analysis

Fix #13380 and #17676 by

1. Changing `raiseIO#` to have `topDiv` instead of `botDiv`
2. Give it special treatment in `Simplifier.Util.mkArgInfo`, treating it
   as if it still had `botDiv`, to recover dead code elimination.

This is the first commit of the plan outlined in
!2525 (comment 260886).