[GHC] #10913: deprecate and then remove -fwarn-hi-shadowing

[GHC]

#10913: deprecate and then remove -fwarn-hi-shadowing
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        Reporter:  osa1              |                Owner:  ChrisU
            Type:  task              |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ChrisU):

 Should I deprecate it, or just remove it immediately?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10913#comment:5>
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