[GHC] #9713: Update comment about C helper for dynamic exports.

[GHC]

#9713: Update comment about C helper for dynamic exports.
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              Reporter:  int-e       |            Owner:
                  Type:  task        |           Status:  patch
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Easy (less than 1
       Type of failure:  Other       |  hour)
             Test Case:              |       Blocked By:
              Blocking:              |  Related Tickets:
Differential Revisions:              |
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"ddb484c2335c75f8fd767f54377e418db400aede/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ddb484c2335c75f8fd767f54377e418db400aede"
 Update comment about C helper for foreign exports (#9713)

 Signed-off-by: Austin Seipp <austin at well-typed.com>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9713#comment:6>
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