[GHC] #11493: Merge compact normal forms

[GHC]

#11493: Merge compact normal forms
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           Reporter:  bgamari        |             Owner:  ezyang
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.2.1
          Component:                 |           Version:  7.10.3
  libraries/compact                  |
           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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 Merge Yang and Campagna's [[Compact Normal Forms
 work|http://ezyang.com/compact.html]].

 There are several pieces to this,

  * Types and construction logic for compact regions (see Phab:D1264)
  * Serialization and fixup logic (currently also in Phab:D1264)
  * Striped allocator for heap sharing between processes (allocator in
 Phab:D1434, CNF support in Phab:D1435).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11493>
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