benchmark: always throw the same Error instance

Stack trace capturing currently accounts for 40 % of the benchmark
running time. Always throwing the same exception object removes
that overhead and lets the benchmark be more focused on what it is
supposed to measure.

Refs: https://github.com/nodejs/node/pull/34512#issuecomment-663977271

PR-URL: https://github.com/nodejs/node/pull/34523


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Andrey Pechkurov <apechkurov@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>