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buffer: improve copy() performance

Rodrigo Muino Tomonari requested to merge github/fork/mscdex/buffer-copy-perf into master

Results of included benchmark:

                                                               confidence improvement accuracy (*)   (**)   (***)
 buffers/buffer-copy.js n=6000000 partial='false' bytes=0            ***    580.96 %       ±3.05% ±4.06%  ±5.30%
 buffers/buffer-copy.js n=6000000 partial='false' bytes=8            ***    179.90 %       ±5.71% ±7.69% ±10.20%
 buffers/buffer-copy.js n=6000000 partial='false' bytes=128          ***    174.81 %       ±1.17% ±1.56%  ±2.05%
 buffers/buffer-copy.js n=6000000 partial='false' bytes=32768          *      3.62 %       ±3.30% ±4.44%  ±5.89%
 buffers/buffer-copy.js n=6000000 partial='true' bytes=0             ***    566.67 %       ±3.63% ±4.87%  ±6.42%
 buffers/buffer-copy.js n=6000000 partial='true' bytes=8             ***     24.66 %       ±1.17% ±1.57%  ±2.05%
 buffers/buffer-copy.js n=6000000 partial='true' bytes=128           ***     19.53 %       ±0.61% ±0.81%  ±1.06%
 buffers/buffer-copy.js n=6000000 partial='true' bytes=32768                 -0.52 %       ±0.98% ±1.31%  ±1.70%
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

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