Don't use iterator addresses in IteratorComparator

The addresses of the iterator values are non-deterministic (i.e. they
depend on where the values were allocated). This causes stability issues
when fuzzing (e.g. in the `txorphan` and `mini_miner` harnesses), due
the orders (derived from IteratorComparator) not being deterministic.

Improve stability by comparing the first element in the iterator value
pair instead of using the the value addresses.

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