[GHC] #12357: Increasing maximum constraint tuple size significantly blows up compiler allocations

[GHC]

#12357: Increasing maximum constraint tuple size significantly blows up compiler
allocations
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2400
       Wiki Page:                    |
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Comment (by bgamari):

 Unfortunately it looks like option 2 is somewhat of a dead-end as it would
 require that we make all of the type reps `WiredIn`, since we need to be
 able to look up the `Id` from the `Name` in order to inspect the
 `IdDetails`. This is all very yucky.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12357#comment:31>
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