[GHC] #11049: Allow CallStacks to be hidden or cut

[GHC]

#11049: Allow CallStacks to be hidden or cut
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        Reporter:  nomeata           |                Owner:  gridaphobe
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11035            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by gridaphobe):

 I've added Joachim's description and an implementation sketch to the
 original
 [https://ghc.haskell.org/trac/ghc/wiki/ExplicitCallStack/ImplicitLocations#Extension:GroomingtheCallStack
 ImplicitLocations wiki page].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11049#comment:8>
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