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

[GHC]

#8131: T7571 with WAY=llvm fails, but not WAY=optllvm
-------------------------------------+-------------------------------------
        Reporter:  thoughtpolice     |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.7
      Resolution:                    |                Keywords:
Operating System:  Windows           |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |  llvm/should_compile/T8131
                                     |                Blocking:
                                     |  Differential Revisions:  Phab:D624
-------------------------------------+-------------------------------------
Changes (by thomie):

 * owner:  rwbarton =>
 * resolution:  fixed =>
 * status:  closed => new
 * os:  Unknown/Multiple => Windows


Comment:

 This test is failing hard on Windows.
 {{{
 +ghc: panic! (the 'impossible' happened)
 +  (GHC version 7.11.20150713 for x86_64-unknown-mingw32):
 +       <<loop>>
 +
 +Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 \ No newline at end of file
 *** unexpected failure for T8131(normal)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8131#comment:17>
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