[GHC] #9430: implement more arithmetic operations natively in the LLVM backend

[GHC]

#9430: implement more arithmetic operations natively in the LLVM backend
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        Reporter:  rwbarton          |                   Owner:  michalt
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (LLVM)   |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Changes (by michalt):

 * owner:   => michalt


Comment:

 This looks like a nice way to learn more about LLVM backend, so I've
 started working on adding support for: `MO_Add2` and `MO_{Add,Sub}IntC`. I
 hope to send something out within the next few days.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9430#comment:3>
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