[GHC] #15535: Expose the StableName constructor

[GHC]

#15535: Expose the StableName constructor
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           Reporter:  dfeuer         |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.8.1
          Component:  Core           |           Version:  8.4.3
  Libraries                          |
           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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 A `StableName` is just a wrapper around `StableName#`, but we don't reveal
 that anywhere. That means that user code needs to use `unsafeCoerce` to
 convert between `StableName` and `StableName#`, which seems terrible.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15535>
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