ArenaAllocator: fill re-claimed memory with byte pattern

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

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

Project coverage is 89.55%. Comparing base (c3ddb33) to head (cdea6a1). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #542 +/- ## ========================================== + Coverage 89.43% 89.55% +0.11% ========================================== Files 315 317 +2 Lines 10794 10900 +106 Branches 1076 1090 +14 ========================================== + Hits 9654 9761 +107 + Misses 1130 1129 -1 Partials 10 10 ```

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