Robert O'Callahan 2f81c55389 Make mfp const methods thread-safe. ...

In particular, we make the parent links relaxed atomics so concurrent
`ifind()` calls are safe.

This may appear to cause a tiny performance regression but as discussed
in https://yosyshq.discourse.group/t/parallel-optmergepass-implementation/87/16
this is probably just noise.

2025-10-06 22:44:01 +00:00

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