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

[GHC]

#13540: Enable -msse2 by default on i386
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  task              |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"e5e07be2df1a0d6f1cb47e9d301053445020589c/ghc" e5e07be/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e5e07be2df1a0d6f1cb47e9d301053445020589c"
 base: Run num009 with -msse2 on i386

 x87's transcendental instructions are terribly imprecise and fail this
 test.
 Moreover, we really ouch to enable -mse2 on i386 by default as it is
 nearly
 universally supported at this point. See #13540.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13540#comment:2>
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