[GHC] #9837: Introduce a logging API to GHC

[GHC]

#9837: Introduce a logging API to GHC
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              Reporter:  rodlogic    |            Owner:
                  Type:  task        |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by rodlogic):

 Yes, I opened the ticket thinking about the compiler not the runtime.
 Right now if you turn the verbosity on you will see a blob of output that
 is hard to parse and could benefit from a tidy up.

 Maybe the current v[1-3] is already good enough, I think the main point is
 to centralize logging. Again, if there is a pattern to this that I am
 missing here, please let me know.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9837#comment:2>
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