[GHC] #9532: Expose new CLZ/CTZ primops via `Data.Bits` interface

[GHC]

#9532: Expose new CLZ/CTZ primops via `Data.Bits` interface
-------------------------------------+-------------------------------------
       Reporter:  hvr                |                   Owner:
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:  7.10.1
      Component:  libraries/base     |                 Version:
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:  #9340              |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:  Phab:D158
-------------------------------------+-------------------------------------
 GHC now provides optimized CLZ/CTZ primops (see #9340), this ticket is
 about exposing those in a more convenient way.

 This was proposed as

   http://www.haskell.org/pipermail/libraries/2014-August/023567.html

 and passed.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9532>
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