[GHC] #12892: Improve type safety in the RTS

[GHC]

#12892: Improve type safety in the RTS
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           Reporter:  dobenour       |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Runtime        |           Version:  8.0.1
  System                             |
           Keywords:                 |  Operating System:  Unknown/Multiple
       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 RTS must (by virtue of its job) be type unsafe, but it doesn't need to
 be gratuitously so.  Currently, there are a lot of dubious conversions,
 pointer casts that cast away `const`, and other questionable practices.

 This task covers improving the RTS's type safety.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12892>
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