[GHC] #15953: GHC always dumps the output of -ddump-hpc to STDOUT

[GHC]

#15953: GHC always dumps the output of -ddump-hpc to STDOUT
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           Reporter:  ckoparkar      |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.8.1
          Component:  Compiler       |           Version:  8.6.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Instead, it should write the output to a file if `-ddump-to-file` is
 enabled.

 `-ddump-core-stats` also has a similar problem. But given that it always
 prints just one line, maybe it should continue to print to `STDOUT`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15953>
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