[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:
            Type:  bug               |                  Status:  closed
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.7
      Resolution:  fixed             |                Keywords:
Operating System:  Windows           |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
                                     |  llvm/should_compile/T8131
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D624
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Comment (by rwbarton):

 This panic is quite interesting though, since there is in fact some new
 loopy stuff in the Cmm parser. Too bad it is only on Windows...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8131#comment:19>
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