stream: inline unbuffered _write

PR-URL: #32886
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/_stream_writable.js

@@ -371,7 +371,12 @@ function writeOrBuffer(stream, state, chunk, encoding, cb) {
     }
     state.bufferedRequestCount += 1;
   } else {
-    doWrite(stream, state, false, len, chunk, encoding, cb);
+    state.writelen = len;
+    state.writecb = cb;
+    state.writing = true;
+    state.sync = true;
+    stream._write(chunk, encoding, state.onwrite);
+    state.sync = false;
   }
 
   // Return false if errored or destroyed in order to break