[GHC] #11477: Remove -Wamp

[GHC]

#11477: Remove -Wamp
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  RolandSenn
            Type:  task              |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab: D4785
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RolandSenn):

 * status:  new => patch
 * differential:   => Phab: D4785


Comment:

 This is my first patch by Phabricator. I'm not sure, whether I really
 submitted this patch correctly.
 [https://phabricator.haskell.org/D4785
 https://phabricator.haskell.org/D4785]

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11477#comment:3>
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