Properly initialize _override executor globals #16658
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These have been introduced a while ago[1], but their initialization has been overlooked. Since we cannot rely on TLS variables to be zeroed, we catch up on this.
[1] e3ef7bb
Noticed this due to https://github.com/php/php-src/actions/runs/11615281464/job/32345470147#step:6:79. Since extensions might access
EG(filename_override)
andEG_(lineno_override)
we better fix this for all affected PHP versions.cc @iluuu1994