[GHC] #8858: Wrong maxStkSize calculation

[GHC]

#8858: Wrong maxStkSize calculation
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       Reporter:  awson             |             Owner:  simonmar
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Runtime System    |           Version:  7.8.1-rc2
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 When fighting with #8839, I've found what I think is a bug in `maxStkSize`
 calculation: if `getPhysicalMemorySize` succeeds, we set `maxStkSize` in
 bytes, not words.

 It did not manifest itself yet, but I've decided to provide a patch.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8858>
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