### Provide an optimized replicateM_ implementation #11795

In my testing, the worker/wrapper transformation applied here significantly decreases the number of allocations performed when using replicateM_. Additionally, this version of the function behaves correctly for negative numbers (namely, it will behave the same as replicateM_ 0, which is what previous versions of base have done). Reviewers: bgamari, simonpj, hvr, austin Reviewed By: bgamari, simonpj, austin Subscribers: nomeata, simonpj, mpickering, thomie Differential Revision: https://phabricator.haskell.org/D2086 GHC Trac Issues: #11795

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