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This lays the initial groundwork for enabling the use of IsolateGroups. Every isolate in V8 is created within a group. When pointer compression is enabled, all isolates within a single group are limited to a 4 GB shared pointer cage. By default, all isolates in the process share the same group, which means that when running with pointer compression, the entire process would be limited to a single 4 GB shared pointer cage. But, we can create as many IsolateGroups as we want, limited only by the amount of virtual memory available on the machine. PR-URL: https://github.com/nodejs/node/pull/60254 Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Stephen Belanger <admin@stephenbelanger.com> Reviewed-By: Michaël Zasso <targos@protonmail.com>