[GHC] #13190: Add a flag to dump compiler output as JSON

[GHC]

#13190: Add a flag to dump compiler output as JSON
-------------------------------------+-------------------------------------
           Reporter:  mpickering     |             Owner:  mpickering
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.2.1
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):  Phab:D3010     |         Wiki Page:
-------------------------------------+-------------------------------------
 This ticket is to track the `-ddump-json` flag which is implemented by
 Phab:D3010.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13190>
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