[GHC] #12790: GHC 8.0.1 uses copious amounts of RAM and time when trying to compile lambdabot-haskell-plugins

[GHC]

#12790: GHC 8.0.1 uses copious amounts of RAM and time when trying to compile
lambdabot-haskell-plugins
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        Reporter:  clint             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Thankfully, Simon has fixed #12936, so now we can compile `parsec` on GHC
 HEAD without issue.

 Another interesting tidbit: when compiling with `-O -prof`, it exhibits
 slowdown, but with `-O -prof -fprof-auto`, it doesn't!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12790#comment:13>
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