[GHC] #10168: generalize filterM, mapAndUnzipM, zipWithM, zipWithM_, replicateM, replicateM_

[GHC]

#10168: generalize filterM, mapAndUnzipM, zipWithM, zipWithM_, replicateM,
replicateM_
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        Reporter:  strake888         |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Core Libraries    |              Version:  7.10.1-rc1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1324
       Wiki Page:                    |
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Comment (by dfeuer):

 My concern is that it will add that tiny factor to tight loops in `IO` and
 `ST` where every tiny little bit counts. Admittedly, the fact that I can't
 use an `STRef s Int` counter and get GHC to put it in a register rules out
 the use of `replicateM_` for a significant class of such loops, but I
 suspect my point is still valid.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10168#comment:19>
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