[GHC] #13540: Enable -msse2 by default on i386

[GHC]

#13540: Enable -msse2 by default on i386
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  high           |         Milestone:  8.4.1
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 SSE2 has been around for nearly 15 years now and at this point it is
 supported nearly universally. Currently we pass `-msse2` to numerically-
 sensitive testsuite tests since x87 is too imprecise.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13540>
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