[GHC] #9192: Add sameByteArray#

[GHC]

#9192: Add sameByteArray#
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       Reporter:  tibbe             |             Owner:
           Type:  feature request   |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Compiler          |           Version:  7.8.2
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 We have `sameMutableByteArray#` so we ought to have `sameByteArray#` as
 well, allowing for cheap equality checks.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9192>
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