[GHC] #8836: ghc 7.6.3 and 7.4.2 hang on -O2

[GHC]

#8836: ghc 7.6.3 and 7.4.2 hang on -O2
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        Reporter:  tsuraan                  |            Owner:
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:
       Component:  Compiler                 |          Version:  7.6.3
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  GHC doesn't work at all  |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
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Comment (by gelisam):

 I can reproduce the issue with 7.6.3 (removing the -fllvm flag), but not
 with 7.8.20140130 (also removing the upper bound on base). Must have been
 fixed already.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8836#comment:2>
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