[GHC] #11219: Implement fine-grained `-Werror=...` facility

[GHC]

#11219: Implement fine-grained `-Werror=...` facility
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        Reporter:  hvr               |                Owner:  quchen
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11218            |  Differential Rev(s):
       Wiki Page:  Design/Warnings   |
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Changes (by hvr):

 * related:   => #11218


Comment:

 this is related to #11218 as we want less confusing `-W`-flags/tokens to
 go together with `-Werror=...`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11219#comment:1>
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