Fix AOT undef-var guards for foreach-by-ref and native function locals (re #23471)

[PurHur]

Summary

• Restore differential --aot parity on i11_foreach_by_ref and e28_float_widen_mul_escape after the AOT: undef-var in closures/functions + error_get_last file/line for float deprecations #35643 assigned-flag regression
• Skip ZEND_CHECK_UNDEFINED_VAR for foreach-by-ref CVs; mark assigned on by-ref iter/assign paths
• Track native stack locals (long/double/bool) for assigned flags and mark VALUE-wrap / same-type assigns

Test plan

• ./script/aot-smoke.sh → 8 passed, 0 failed
• ./script/docker-exec.sh -- bash -lc '…' repro: i11_foreach_by_ref.php + e28_float_widen_mul_escape.php byte-identical to Zend
• ./script/phpunit.sh --filter UndefinedVariableClosureAotTest → OK (1 test, 4 assertions)
• Full ./script/differential-sweep.sh --aot not re-run end-to-end this run (prior pass: 123/125; both known DIFF cases fixed individually)

Closes #23471

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