[GHC] #13448: Make HPC use an RTS option to select the tix file

[GHC]

#13448: Make HPC use an RTS option to select the tix file
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           Reporter:  dfeuer         |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.4.1
          Component:  Code Coverage  |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Other
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Phab:D3357 will document the currently-undocumented `HPCTIXFILE`
 environment variable. I think, however, that we really should change how
 that's controlled. Make it an RTS option like any other, which can be
 controlled using `with-rtsopts`, `+RTS`, or the `GHCRTS` environment
 variable.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13448>
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