[GHC] #9917: ddump-llvm runs opt/llc even when -fllvm isnt set

[GHC]

#9917: ddump-llvm runs opt/llc even when -fllvm isnt set
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        Reporter:  carter            |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  low               |               Milestone:
       Component:  Documentation     |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Changes (by thomie):

 * priority:  normal => low
 * component:  Compiler => Documentation


Comment:

 `-ddump-llvm` currently implies `-fllvm`, as do `-keep-llvm-file` and
 `-keep-llvm-files`.

 This could be mentioned in the user's guide.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9917#comment:1>
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