[GHC] #7181: Add documentation on heap-profile file format.

[GHC]

#7181: Add documentation on heap-profile file format.
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        Reporter:  schernichkin      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Documentation     |              Version:  7.4.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * milestone:   => 8.2.1


Comment:

 We should be able to close this with the 8.2 release as we will support
 sending heap profiler census data to the eventlog, the encoding of which
 is documented in the users guide.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7181#comment:7>
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