[GHC] #8788: Remove old comment

[GHC]

#8788: Remove old comment
-------------------------------+-------------------------------------------
        Reporter:  Tarrasch    |            Owner:  simonmar
            Type:  task        |           Status:  closed
        Priority:  lowest      |        Milestone:
       Component:  Runtime     |          Version:  7.6.3
  System                       |         Keywords:
      Resolution:  invalid     |     Architecture:  Unknown/Multiple
Operating System:              |       Difficulty:  Easy (less than 1 hour)
  Unknown/Multiple             |       Blocked By:
 Type of failure:              |  Related Tickets:
  None/Unknown                 |
       Test Case:              |
        Blocking:              |
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Changes (by simonmar):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 The code fragments that the comment is referring to don't have info tables
 (`stg_ap_stk` and `stg_ap_stk_save`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8788#comment:4>
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