Speed Meta.atom_with_hole up

[wdanilo]

This task is automatically imported from the old Task Issue Board and it was originally created by jaroslavtulach.
Original issue is here.

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#183578531 introduced (via PR-4023) the Meta.atom_with_hole as a replacement for Unsafe.set_atom_field. It is safer than the unsafe original version, but right now it is 2-3x slower.

The goal of this pivotal is to investigate the reasons and speed things up a bit.

Blockers:

#183578531 resolved