[GHC] #8131: T7571 with WAY=llvm fails, but not WAY=optllvm

[GHC]

#8131: T7571 with WAY=llvm fails, but not WAY=optllvm
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        Reporter:  thoughtpolice     |                   Owner:  rwbarton
            Type:  bug               |                  Status:  infoneeded
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.7
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |  llvm/should_compile/T8131
                                     |                Blocking:
                                     |  Differential Revisions:
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Comment (by bgamari):

 I've rebased and cleaned up these patches and opened D624 to propose them
 for merge.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8131#comment:11>
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