[GHC] #4121: Refactor the plumbing of CafInfo to make it more robust

[GHC]

#4121: Refactor the plumbing of CafInfo to make it more robust
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              Reporter:  dterei      |            Owner:
                  Type:  task        |           Status:  new
              Priority:  low         |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  6.12.2
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 I've added it to my list, because it does indeed need attention.

 I think the right thing is to extract the information during the core-to-
 STG pass, and back-patch it into the interface-file info. The difficulty
 is really just ensuring that we don't thereby make space behaviour a lot
 worse by, in effect, having two copies of the program in memory at once.

 I'd welcome help with doing this. Not hard, but needs a bit of care.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4121#comment:10>
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