[clang] Implement lifetime analysis for lifetime_capture_by(X) (#115921) This PR uses the existing lifetime analysis for the `capture_by` attribute. The analysis is behind `-Wdangling-capture` warning and is disabled by default for now. Once it is found to be stable, it will be default enabled. Planned followup: - add implicit inference of this attribute on STL container methods like `std::vector::push_back`. - (consider) warning if capturing `X` cannot capture anything. It should be a reference, pointer or a view type. - refactoring temporary visitors and other related handlers. - start discussing `__global` vs `global` in the annotation in a separate PR. --------- Co-authored-by: Boaz Brickner <brickner@google.com>
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