benchmark: improve module-loader benchmark

Add more benchmark options to properly verify the gains.

This makes sure the benchmark also tests requiring the same module
again instead of only loading each module only once.

PR-URL: https://github.com/nodejs/node/pull/26970
Refs: https://github.com/nodejs/node/pull/25362


Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>