[GHC] #8852: 7.8.1 uses a lot of memory when compiling attoparsec programs using <|>

[GHC]

#8852: 7.8.1 uses a lot of memory when compiling attoparsec programs using <|>
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              Reporter:  joelteon    |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.1-rc2
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Compile-    |       Blocked By:
  time performance bug               |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 This is the dreaded `SpecConstr` blowup again (see #8980, #8941
 (possibly), #8960, #7898, #7068, #7944, #5550, #8836).

 Compiling with `-fno-spec-constr` makes it go through fine, so that's a
 workaround.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8852#comment:3>
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