[GHC] #11030: D757 (emit Typeable at type definition site) regresses T3294 max_bytes_used by factor of two

[GHC]

#11030: D757 (emit Typeable at type definition site) regresses T3294 max_bytes_used
by factor of two
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  bgamari
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.11
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  performance bug
          Test Case:  T3294          |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 I noticed that D757 caused max_bytes_allocated to go from 45MBytes to
 96MBytes while updating the testsuite. This may be expected but I want to
 ensure I look into this since the test defines only one type (albeit with
 many fields) and a `Show` instance so we wouldn't necessarily expect this
 test to regress by this amount.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11030>
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