[GHC] #12635: Compress core in interface files

[GHC]

#12635: Compress core in interface files
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           Reporter:  nomeata        |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           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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 Inspired by #12626 and #12618, the idea came up of storing less stuff
 about Core expressions in interface files if we can infer it while reading
 it.

 For example, in the unfolding of an function `Int -> Int`, which might
 look like `\x::Int → ...`, the type annotation of the variable is
 obviously redundant.

 This avenue should be explored more.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12635>
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