Investigate a change in the benchmark results

The benchmark runner was down recently. After bringing it up we noticed that results had changed. Some results are faster, some results are slower, and the changes are relatively significant.

These are the benchmarks with the most significant changes.

• tst_bench_lancebench
• tst_bench_qpixmap
• tst_bench_qwaitcondition
• tst_bench_shared_ptr
• tst_bench_tostring

The changes can be inspected in this dashboard.
http://testresults.qt.io/grafana/d/S6JmO-yVk/core-benchmarks?orgId=1&from=2024-08-24T11:51:32.155Z&to=2025-02-20T11:51:32.155Z&timezone=utc&var-host=badlands&var-branch=dev&var-component=$__all&var-test_file=$__all&var-test_function=$__all&var-data_tag=$__all