Fix incorrect carrier count statistics after using instrument module

[sverker]

The number of carriers in a shared pool (allctr->cpool.stat.no_carriers) was decremented every time a call to instrument:allocations or instrument:carriers yielded while traversing the pool.

Also make sure to not free or re-insert a yield cursor (dummy carrier) into shared carrier pool until thread progress has passed.

[github-actions[bot]]

CT Test Results

    3 files    143 suites   49m 3s :stopwatch: 1 591 tests 1 542 :white_check_mark: 49 :zzz: 0 :x: 2 330 runs  2 256 :white_check_mark: 74 :zzz: 0 :x:

Results for commit d63d6564.

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