[GHC] #11085: Relying on the existence of CallStack in 7.10 breaks bootstrappability with 7.10.1

[GHC]

#11085: Relying on the existence of CallStack in 7.10 breaks bootstrappability with
7.10.1
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        Reporter:  quchen            |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Building GHC      |  Unknown/Multiple
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  D1472
       Wiki Page:                    |
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Comment (by quchen):

 Patch is on Phab.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11085#comment:2>
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