[GHC] #7364: `foo !f = id . f` becomes non-strict with -O2

[GHC]

#7364: `foo !f = id . f` becomes non-strict with -O2
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 Reporter:  shachaf                      |          Owner:                  
     Type:  bug                          |         Status:  new             
 Priority:  normal                       |      Component:  Compiler        
  Version:  7.6.1                        |       Keywords:                  
       Os:  Unknown/Multiple             |   Architecture:  Unknown/Multiple
  Failure:  Incorrect result at runtime  |       Testcase:                  
Blockedby:                               |       Blocking:                  
  Related:                               |  
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Comment(by ezyang):

 Oh, not true, I'm confused about pass ordering; it is a problem with the
 simplifier, not the specializer.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7364#comment:2>
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