[GHC] #12822: Cleanup GHC verbosity flags

[GHC]

#12822: Cleanup GHC verbosity flags
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        Reporter:  hsyl20            |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  newcomer,flags
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by captaintrunky):

 * Attachment "fix12822.patch" added.

 First implementation of unified verbosity flags.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12822>
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