[GHC] #14826: Flatten data types extending other data types in STG

[GHC]

#14826: Flatten data types extending other data types in STG
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        Reporter:  nomeata           |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 A real-life example where people use horrible unsafe tricks to achieve
 essentially this:

 https://github.com/gregorycollins/hashtables/blob/fd385db6c81e157e2922e74664384980a651160e/src/Data/HashTable/Internal/UnsafeTricks.hs#L72

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14826#comment:4>
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