[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 thoughtpolice):

 This looks similar to #7944 and #5550 - can you see where the compiler
 halts during compilation using `-v3` or something?

 In any case, if it's fixed by 7.8, all the better.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8836#comment:3>
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