[GHC] #10448: Implement rest of "Add bifunctor related classes to base"-Proposal

[GHC]

#10448: Implement rest of "Add bifunctor related classes to base"-Proposal
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        Reporter:  hvr               |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  libraries/base    |              Version:
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9682             |  Differential Rev(s):
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Comment (by ekmett):

 It is in the list of simplifications to consider for `Traversable`. If we
 can show it doesn't help measurably, it'd be a win for simplicity, and the
 `(bi)sequenceA` name that nobody likes can then eventually die in favor of
 `(bi)sequence`, whereas the other way there is no actual viable upgrade
 path that supports its removal.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10448#comment:8>
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