[GHC] #10918: Float once-used let binding into a recursive function

[GHC]

#10918: Float once-used let binding into a recursive function
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        Reporter:  nomeata           |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
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Comment (by nomeata):

 A side effect of Call Arity setting the once-used flag on bindings is that
 the code generator does not create update code for such thunks (good!).
 With paraffin something goes wrong, and allocation skyrockets.
 Unfortnately, I was not able to pin-point what goes wrong, despite pulling
 out the ticky-ticky-hammer.

 (Wishful thinking: A tool that takes a -ddump-prep and a ticky report,
 annotates the bindings with the ticky numbers, and then removes all
 uniques from the report, so that I can diff that with a different
 compilation without the uniques obscuring the diff.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10918#comment:11>
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