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

[GHC]

#8308: Resurrect ticky code for counting constructor arity
-------------------------------------+-------------------------------------
        Reporter:  jstolarek         |                Owner:  mlen
            Type:  task              |               Status:  patch
        Priority:  normal            |            Milestone:
       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
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"f0f0ac859257a0b528815adb61d3f024c8bafa16/ghc" f0f0ac8/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="f0f0ac859257a0b528815adb61d3f024c8bafa16"
 Fix histograms for ticky code

 This patch fixes Cmm generation required to produce histograms when
 compiling with -ticky flag, strips dead code from rts/Ticky.c and
 reworks it to use a shared constant in both C and Haskell code.

 Fixes #8308.

 Test Plan: T8308

 Reviewers: jstolarek, simonpj, austin

 Reviewed By: simonpj

 Subscribers: mpickering, simonpj, bgamari, mlen, thomie, jstolarek

 Differential Revision: https://phabricator.haskell.org/D931

 GHC Trac Issues: #8308
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8308#comment:10>
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