[GHC] #10014: Data.Array.Base.elems needlessly calls bounds.

[GHC]

#10014: Data.Array.Base.elems needlessly calls bounds.
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        Reporter:  ekmett            |                   Owner:  ekmett
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Core Libraries    |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by hvr):

 Replying to [ticket:10014 ekmett]:

 > It appears at some point someone optimized it to use the `unsafeAt`, but
 never removed the bounds check.

 that happened here:
 https://git.haskell.org/packages/array.git/commitdiff/0c4b7d714dd82072ea95c5973dc7160428b93235

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10014#comment:1>
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