[GHC] #14660: Improve +RTS -t --machine-readable

[GHC]

#14660: Improve +RTS -t --machine-readable
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        Reporter:  duog              |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.3
      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 mpickering):

 It could just be output as a JSON record rather than relying on having to
 use Haskell tooling to parse it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14660#comment:1>
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