Commits on Jun 3, 2016

1. buffer: Improve creation performance. …

   Improves performance of allocating unsafe buffers, creating buffers from
   an existing ArrayBuffer and creating .slice(...) from existing Buffer by
   avoiding deoptimizing change of prototype after Uint8Array allocation
   in favor of ES6 native subclassing.
   
   This is done through an internal ES6 class that extends Uint8Array and
   is used for allocations, but the regular Buffer function is exposed, so
   calling Buffer(...) with or without `new` continues to work as usual
   and prototype chains are also preserved.
   
   Performance wins for .slice are +120% (2.2x), and, consequently, for
   unsafe allocations up to +95% (1.9x) for small buffers, and for safe
   allocations (zero-filled) up to +30% (1.3x).

   

   RReverser committed Jun 3, 2016
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