[GHC] #13724: Clamping of llvm llc to -O1 and -O2

[GHC]

#13724: Clamping of llvm llc to -O1 and -O2
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        Reporter:  angerman          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler (LLVM)   |              Version:  8.3
      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 bgamari):

 I believe this can be addressed in a way similar to the approach in
 Phab:D4421.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13724#comment:3>
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