stream: improve Readable#from perf

[rluvaton]

Benchmarks

Benchmark URL

15:39:36                                                                             confidence improvement accuracy (*)    (**)   (***)
15:39:36 streams/readable-from.js type='array' n=10000000                                   ***     23.20 %       ±9.27% ±12.34% ±16.09%
15:39:36 streams/readable-from.js type='async-generator' n=10000000                           *      2.28 %       ±1.83%  ±2.44%  ±3.17%
15:39:36 streams/readable-from.js type='sync-generator-with-async-values' n=10000000                 0.48 %       ±1.82%  ±2.42%  ±3.15%
15:39:36 streams/readable-from.js type='sync-generator-with-sync-values' n=10000000         ***     18.26 %       ±2.01%  ±2.68%  ±3.49%