[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:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Profiling         |              Version:  7.7
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D931
       Wiki Page:                    |
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Comment (by bgamari):

 I suspect the issue here is the fact that you built your libraries with
 ticky. The testcase is expecting to see a count of 1 in the
 `RET_NEW_hst_1` ticker, since it expects only the testcase itself to be
 instrumented. However, since you have also instrumented the libraries, the
 count is larger.

 In this sense the testcase as-written may be a bit fragile, although I
 can't think of any great way to fix this without compromising the
 precision of the check in the "normal" case (where the user has
 instrumented their libraries, which is by far more common).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8308#comment:13>
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