[GHC] #13904: LLVM does not need to trash caller-saved registers.

[GHC]

#13904: LLVM does not need to trash caller-saved registers.
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        Reporter:  kavon             |                Owner:  kavon
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  llvm, codegen
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #4992, #4308      |  Differential Rev(s):  Phab:D5190
       Wiki Page:                    |
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Changes (by monoidal):

 * differential:   => Phab:D5190


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13904#comment:8>
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