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buffer: use v8 fast API calls for Buffer.byteLength with sequential one-byte strings

Rodrigo Muino Tomonari requested to merge github/fork/joyeecheung/byte-length-one-byte into main

Depends on https://github.com/nodejs/node/pull/46619

From a local run: I am a bit surprised by the last few numbers, theoretically there should be no difference for them. Curious about what the benchmark CI would show.

                                                                                              confidence improvement accuracy (*)    (**)   (***)
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='four_bytes'                    1.39 %       ±1.78%  ±2.66%  ±4.20%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='one_byte'                      0.40 %       ±0.62%  ±0.95%  ±1.56%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='three_bytes'                   0.84 %       ±3.13%  ±5.01%  ±8.85%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='two_bytes'                    -1.23 %       ±1.66%  ±2.40%  ±3.56%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='four_bytes'               *      1.43 %       ±1.42%  ±2.18%  ±3.58%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='one_byte'               ***     32.48 %       ±1.42%  ±2.05%  ±3.04%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='three_bytes'                    -0.46 %       ±2.74%  ±4.13%  ±6.60%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='two_bytes'                      -0.20 %       ±2.23%  ±3.21%  ±4.74%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='four_bytes'                  -0.06 %       ±1.80%  ±2.64%  ±4.01%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='one_byte'                     0.47 %       ±1.09%  ±1.63%  ±2.59%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='three_bytes'                  0.41 %       ±1.33%  ±2.01%  ±3.19%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='two_bytes'                    1.26 %       ±3.57%  ±5.13%  ±7.56%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='four_bytes'            ***      3.23 %       ±0.78%  ±1.17%  ±1.84%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='one_byte'                       0.57 %       ±5.18%  ±7.99% ±13.25%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='three_bytes'           ***     21.65 %       ±0.91%  ±1.31%  ±1.93%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='two_bytes'             ***     46.84 %       ±2.73%  ±4.37%  ±7.68%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='four_bytes'                   -1.38 %       ±2.36%  ±3.67%  ±6.16%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='one_byte'                     -0.17 %       ±2.79%  ±4.40%  ±7.58%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='three_bytes'                  -0.31 %       ±1.17%  ±1.70%  ±2.56%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='two_bytes'                     0.04 %       ±1.84%  ±2.64%  ±3.88%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='four_bytes'                      0.22 %       ±1.54%  ±2.24%  ±3.38%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='one_byte'                        0.64 %       ±1.49%  ±2.14%  ±3.15%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='three_bytes'                     2.56 %       ±2.77%  ±3.98%  ±5.85%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='two_bytes'                *      8.26 %       ±7.40% ±11.39% ±18.79%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='four_bytes'                 -0.12 %       ±0.67%  ±0.98%  ±1.47%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='one_byte'                    0.40 %       ±1.44%  ±2.08%  ±3.05%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='three_bytes'                 0.17 %       ±2.13%  ±3.10%  ±4.66%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='two_bytes'                   0.25 %       ±1.49%  ±2.29%  ±3.76%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='four_bytes'           ***      4.59 %       ±0.85%  ±1.27%  ±2.01%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='one_byte'                      0.10 %       ±1.32%  ±1.98%  ±3.15%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='three_bytes'          ***     32.02 %       ±0.44%  ±0.67%  ±1.10%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='two_bytes'            ***     74.78 %       ±0.73%  ±1.14%  ±1.91%

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