[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
              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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 This is a spin-of of comment:3:ticket:10180: `exprIsBottom` (which
 currently only takes strictnes signatures into account) should also look
 at the type, via the new `isEmptyTy`.

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