[GHC] #15180: Make Control.Exception.throw levity polymorphic

[GHC]

#15180: Make Control.Exception.throw levity polymorphic
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           Reporter:  andrewthad     |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
  LevityPolymorphism                 |
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The `error` function has a levity-polymorphic type. I propose that the
 same be done for `throw`. I just encountered a situation where I needed
 this, and instead of calling `throw x`, I had to call `raise# (toException
 x)` because `throw` is unnecessarily restrictive.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15180>
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