Fixes integer overflows when supplying values exceeding MAX_SAFE_INTEGER for highWaterMark. PR-URL: https://github.com/nodejs/node/pull/12593 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Luca Maraschi <luca.maraschi@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>