[GHC] #11705: Back port of LlvmCodeGen fix broke 8.0

[GHC]

#11705: Back port of  LlvmCodeGen fix broke 8.0
-------------------------------------+-------------------------------------
           Reporter:  erikd          |             Owner:  erikd
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1-rc2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Commit 1e7764ce in the ghc-8.0 branch (back ported from master) fails to
 compile because it assumes the prelude of ghc-7.10. Specifically:

 {{{
 compiler/llvmGen/LlvmCodeGen.hs:131:12: Not in scope: ‘pure’

 compiler/llvmGen/LlvmCodeGen.hs:140:34:
     Not in scope: ‘<$>’
     Perhaps you meant one of these:
       ‘<+>’ (imported from Outputable), ‘<>’ (imported from Outputable)
 }}}

 etc.

 The fix should be pretty trivial.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11705>
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