[GHC] #12915: cmmImplementSwitchPlans creates duplicate blocks

[GHC]

#12915: cmmImplementSwitchPlans creates duplicate blocks
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        Reporter:  alexbiehl         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 I'm thinking the same as hsyl20. The binary size numbers indicate that
 whatever parts of the standard libraries end up getting linked into all
 the nofib programs got 1% smaller, which is nothing to sneeze at. Might
 also be worth checking out whether this is due to a few small gains and
 whether there might be a cheaper way of getting those gains.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12915#comment:9>
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