[GHC] #10186: exprIsBottom should include isEmptyTy

[GHC]

#10186: exprIsBottom should include isEmptyTy
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        Reporter:  nomeata           |                   Owner:  nomeata
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by nomeata):

 I created a DR for this very small change, basically as a quick way to get
 a validate run started before I go to bed :-) Phab:D754

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10186#comment:1>
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