[php-src] PR #24994: Fix zend_inference: fix unsound shift_left_overflows range when shift…

Pull Request: https://github.com/php/php-src/pull/24994 Author: mkrishna793 ### Summary of Changes In Zend/Optimizer/zend_inference.c, shift_left_overflows(n, s) previously checked safe_shift_left(n, s) > n for negative inputs. When (n << s) wrapped around to a value <= n (such as ZEND_LONG_MIN or negative wrapped values), the check falsely returned false (no overflow). Positive shifts also missed overflow when wrapping around (e.g. 7041795614029497201 << 6). This PR replaces the heuristic with a round-trip arithmetic shift check ((shifted >> s) != n) that soundly detects overflow across all 64-bit and 32-bit inputs. Includes the regression test provided by @arnaud-lb in Zend/tests/shift_left_overflow_range.phpt.