[GHC] #14982: LLVM default -mcpu setting inhibits customization

[GHC]

#14982: LLVM default -mcpu setting inhibits customization
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        Reporter:  tommd             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.2
       Component:  Compiler (LLVM)   |              Version:  8.4.1
      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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Changes (by bgamari):

 * cc: angerman (added)
 * milestone:  8.6.1 => 8.4.2


Comment:

 Any thoughts on what we should do here, Moritz? I'm leaning towards just
 reverting the `-mcpu` change.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14982#comment:1>
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