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stream: optimize writable fast path

Rodrigo Muino Tomonari requested to merge github/fork/nxtedition/writable-simple-buffer into main 
streams/writable-manywrites.js len=1024 callback='no' writev='no' sync='no' n=2000000            ***      2.98 %       ±1.57% ±2.10% ±2.74%
streams/writable-manywrites.js len=1024 callback='no' writev='no' sync='yes' n=2000000           ***     -5.68 %       ±1.01% ±1.36% ±1.78%
streams/writable-manywrites.js len=1024 callback='no' writev='yes' sync='no' n=2000000           ***    -23.13 %       ±2.48% ±3.32% ±4.36%
streams/writable-manywrites.js len=1024 callback='no' writev='yes' sync='yes' n=2000000          ***     -2.80 %       ±1.54% ±2.06% ±2.71%
streams/writable-manywrites.js len=1024 callback='yes' writev='no' sync='no' n=2000000             *      1.48 %       ±1.17% ±1.56% ±2.03%
streams/writable-manywrites.js len=1024 callback='yes' writev='no' sync='yes' n=2000000          ***     -2.59 %       ±0.97% ±1.29% ±1.69%
streams/writable-manywrites.js len=1024 callback='yes' writev='yes' sync='no' n=2000000          ***     -5.82 %       ±2.42% ±3.24% ±4.24%
streams/writable-manywrites.js len=1024 callback='yes' writev='yes' sync='yes' n=2000000                  2.55 %       ±2.77% ±3.69% ±4.80%
streams/writable-manywrites.js len=32768 callback='no' writev='no' sync='no' n=2000000           ***      7.22 %       ±1.57% ±2.10% ±2.73%
streams/writable-manywrites.js len=32768 callback='no' writev='no' sync='yes' n=2000000          ***     10.24 %       ±1.12% ±1.49% ±1.94%
streams/writable-manywrites.js len=32768 callback='no' writev='yes' sync='no' n=2000000          ***      4.59 %       ±1.31% ±1.74% ±2.26%
streams/writable-manywrites.js len=32768 callback='no' writev='yes' sync='yes' n=2000000         ***     10.53 %       ±1.62% ±2.15% ±2.81%
streams/writable-manywrites.js len=32768 callback='yes' writev='no' sync='no' n=2000000          ***      9.04 %       ±1.05% ±1.40% ±1.82%
streams/writable-manywrites.js len=32768 callback='yes' writev='no' sync='yes' n=2000000         ***     12.41 %       ±2.44% ±3.25% ±4.23%
streams/writable-manywrites.js len=32768 callback='yes' writev='yes' sync='no' n=2000000         ***      5.05 %       ±1.93% ±2.58% ±3.37%
streams/writable-manywrites.js len=32768 callback='yes' writev='yes' sync='yes' n=2000000        ***      9.61 %       ±1.70% ±2.27% ±2.96%

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