Commits on Jul 5, 2016

1. buffer: speed up swap16/32, add swap64 …

   * Speed up buffer.swap16 and swap32 by using builtins. Up to ~6x gain.
     Drop transition point between JS and C++ implementations accordingly.
     Amount of performance improvement not only depends on buffer size but
     also memory alignment.
   * Fix tests: C++ impl tests were testing 0-filled buffers so were
     always passing.
   * Add similar buffer.swap64 method.
   * Make buffer-swap benchmark mirror JS impl.
   
   doc/api/buffer.markdown has an entry of "added: REPLACEME" that should
   be changed to the correct release number before tagged.
   
   Because node is currently using a very old version of cpplint.py it
   doesn't know that std::swap() has moved from <algorithm> to <utility> in
   c++11. So until cpplint.py is updated simply NOLINT the line.
   Technically it should be NOLINT(build/include_what_you_use), but that
   puts the line over 80 characters causing another lint error.
   
   PR-URL: nodejs#7157
   Reviewed-By: Trevor Norris <trev.norris@gmail.com>
   Reviewed-By: James M Snell <jasnell@gmail.com>

   

   zbjornson authored and addaleax committed Jul 5, 2016
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