[GHC] #8308: Resurrect ticky code for counting constructor arity

[GHC]

#8308: Resurrect ticky code for counting constructor arity
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        Reporter:  jstolarek         |                   Owner:  mlen
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Profiling         |                 Version:  7.7
      Resolution:                    |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Other             |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by mlen):

 jstolarek: I made some progress recently: relevant constants
 (`TICKY_BIN_COUNT`) are defined only in `includes/stg/Ticky.h` and then
 made available to Haskell code via `utils/deriveConstants`.
 The last thing that's left is making sure counting functions are used
 where they are needed and refactoring `rts/Ticky.c` a bit.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8308#comment:6>
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