[GHC] #8834: 64-bit windows cabal.exe segfaults in GC

[GHC]

#8834: 64-bit windows cabal.exe segfaults in GC
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        Reporter:  awson          |            Owner:  jstolarek
            Type:  bug            |           Status:  patch
        Priority:  highest        |        Milestone:  7.8.1
       Component:  Compiler       |          Version:  7.8.1-rc2
      Resolution:                 |         Keywords:
Operating System:  Windows        |     Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:                 |       Blocked By:
        Blocking:                 |  Related Tickets:
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Comment (by simonpj):

 Austin will try:
  * Re-applying the `CmmSink` patch
  * Adding R3 and R4 to the caller-saves register for 64-bit
 That would be a better fix, because if they really are caller-saves then
 reverting `CmmSink` won't necessarily cure everything.

 Still needs more investigation for the ultimate cause.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8834#comment:62>
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