[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 osa1):

 > So I think you only need a MUCH simpler function.

 Indeed, my function is much simpler. The whole analysis is implemented in
 69 lines:
 https://github.com/osa1/ghc/blob/7eeb49f1a034d500cad69151d205985f1fef3f31/compiler/stgSyn/StgCafAnal.hs

 I just booted GHC with updated iface files. I'll now try to validate.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9718#comment:24>
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