[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:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  low            |         Milestone:
          Component:  Compiler       |           Version:  8.6.3
  (CodeGen)                          |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:  x86_64         |   Type of failure:  None/Unknown
  (amd64)                            |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 I started implementing this in
 https://gitlab.haskell.org/ghc/ghc/merge_requests/27

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