stream: writable state bitmap

PR-URL: #49899
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Raz Luvaton <rluvaton@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

Author: ronag

benchmark/streams/writable-manywrites.js

@@ -4,7 +4,7 @@ const common = require('../common');
 constWritable=require('stream').Writable;
 
 constbench=common.createBenchmark(main,{
-n: [2e6],
+n: [1e5],
 sync: ['yes','no'],
 writev: ['yes','no'],
 callback: ['yes','no'],
@@ -13,7 +13,7 @@ const bench = common.createBenchmark(main, {
 
 functionmain({ n, sync, writev, callback, len }){
 constb=Buffer.allocUnsafe(len);
-consts=newWritable();
+consts=newWritable({highWaterMark: 16*1024});
 sync=sync==='yes';
 
 constwritecb=(cb)=>{