[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:  #8949             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Phyx-):

 Just want to point out that neither the linux elf nor Windows GHCi linkers
 (non-dynamic way) currently honor section alignment. so using SSE2 more
 aggressively would likely cause issues here.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13540#comment:4>
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