[GHC] #8980: ghc-7.8.1 -O2 eats excessive amounts of RAM, highlighting-kate and pandoc-citeproc

[GHC]

#8980: ghc-7.8.1 -O2 eats excessive amounts of RAM, highlighting-kate and pandoc-
citeproc
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        Reporter:  slyfox            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 So this is another example of the `SpecConstr` blow-up, cf #7898, #7068,
 #7944, #5550, #8836.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8980#comment:1>
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