[GHC] #9718: Avoid TidyPgm predicting what CorePrep will do

[GHC]

#9718: Avoid TidyPgm predicting what CorePrep will do
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        Reporter:  simonpj           |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.3
      Resolution:                    |             Keywords:  CodeGen, CAFs
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 simonpj):

 Re commment:20
 {{{
 sat_s7Je :: GHC.Types.Int
 [LclId] =
     CCS_DONT_CARE GHC.Types.I#! [68#];
 }}}
 This is introduced in core-to-stg, and perhaps indeed its CAFFy flag is
 conservative.  So that may be a useful improvement.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9718#comment:23>
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