[GHC] #16086: Compile countLeadingZeros to lzcnt if -mbmi2 is set

[GHC]

#16086: Compile countLeadingZeros to lzcnt if -mbmi2 is set
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        Reporter:  ethercrow         |                Owner:  ethercrow
            Type:  feature request   |               Status:  patch
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
  (CodeGen)                          |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by ethercrow):

 * status:  new => patch


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16086#comment:2>
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