[GHC] #15448: Allow execution of stage2 compiler to happen later

[GHC]

#15448: Allow execution of stage2 compiler to happen later
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Build System   |           Version:  8.4.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:  #14949
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Currently cross-compiled bindists are rather incomplete since we can't run
 the stage2 compiler to build various utilities (e.g. `hp2ps` and
 `haddock`). Ideally we would be able to run a build up to the point where
 we need to run host code, package up the build tree, and finish the build
 on the host. There are a number of challenges that this brings, but it
 will ultimately make it far easier to build proper non-Linux/amd64
 bindists on CircleCI (#14949).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15448>
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