[GHC] #15535: Expose the StableName constructor

[GHC]

#15535: Expose the StableName constructor
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Core Libraries    |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5078
       Wiki Page:                    |
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Comment (by osa1):

 Out of curiosity, how do you coerce a `StableName` to a `StableName#`?
 `StableName` is a `data` so you'd have to first coerce it to constructor
 with one non-pointer field that is as large as a `StableName#`, and then
 read that field. Sounds tricky ...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15535#comment:2>
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