Fix exception property offset computation for PHP 8.1+

[bwoebi]

They're shared across all inheritors on PHP 8.1+ and thus only need to be incremented on the specific ce.

This issue arises when a property from an inherited internal class extending Exception is itself inherited by another class.

Also fix an accidentally discovered use-after-free with peer.service.

Fixes #2898.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.21%. Comparing base (3f3547d) to head (72ff094).

Additional details and impacted files

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Benchmarks [ tracer ]

Benchmark execution time: 2024-10-17 13:26:16

Comparing candidate commit 72ff0947678c55e36da1d130ea334438d2b94f40 in PR branch bob/fix-ex with baseline commit 3f3547dc7d60b86a6f7dcccc46f5173b6edc8cd7 in branch master.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 177 metrics, 0 unstable metrics.

scenario:TraceFlushBench/benchFlushTrace

• 🟩 execution_time [-1000.000ns; -1000.000ns] or [-50.000%; -50.000%]