Using an iterable WeakMap (a data-structure that uses WeakRef and
WeakMap), we are able to: stop relying on Module._cache to
serialize source maps; stop requiring an error object when calling
findSourceMap().
PR-URL: https://github.com/nodejs/node/pull/35915
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
