[LifetimeSafety] Test lifetime safety on stmt-local analysis test suite (#175906) Add CFG-based lifetime analysis tests for dangling pointer detection alongside the existing AST-based analysis. This change helps validate that the new CFG-based lifetime analysis correctly detects the same dangling pointer issues as the existing AST-based analysis. It also documents current limitations of the CFG-based approach with FIXME comments, providing a roadmap for future improvements. The test ensures that both analysis methods can work side-by-side, with the CFG-based analysis eventually intended to replace the AST-based approach.
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