[GHC] #11472: Remove CallStack CPP guards in GHC 8.2

[GHC]

#11472: Remove CallStack CPP guards in GHC 8.2
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        Reporter:  bgamari           |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 Does 8.2 need to be able to build with 7.10.1? If so then we can't remove
 these CPP guards entirely until 8.4.

 This is an honest question, by the way. I don't know whether our policy is
 that 8.2 should be buildable by ''every'' 7.10.* release, or ''some''
 7.10.* release, or perhaps the ''last'' 7.10.* release. If we somehow
 released a compiler that was completely incapable of bootstrapping GHC, it
 would be a serious problem for the "every" policy. Is this policy written
 down somewhere?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11472#comment:5>
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