Fix poisoning leftover for vector and string ASan annotations#6285

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amyw-msft wants to merge 9 commits into

microsoft:mainfrom

amyw-msft:asan_leftover_poisoning

Commits on May 13, 2026

Modify vector and string annotations to extend 'last valid' point to 'end' point in situations where the end has been extended to the end of the allocation block.
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Commits on May 14, 2026

Commits on May 15, 2026

Fix shadowing
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Commits on Jun 3, 2026

Lightly refactor STL annotation logic for vector/string to attempt to imbue a sense of intent at the call site (i.e. 'end' pointers should be realigned when overpoisoning, but all other pointers sh…
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Remove gh6276 specific test since it's handled by other tests now.
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Commits on Jun 4, 2026

Commits on Jun 9, 2026

Remove unused re-alignment code, rewrite comments describing how to use __sanitizer_annotate_contiguous_container and its alignment requirements/behavior in those cases, as well as an example of th…
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