Cherrypick 3 commits to Stable/21.x#12044

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ziqingluo-90 merged 3 commits intostable/21.xfrom

ziqing/cherrypick-unsafe-buffer-usage-154072130-156264388-PR170496

Jan 2, 2026

Commits on Dec 22, 2025

[-Wunsafe-buffer-usage] Support safe patterns of "%.*s" in printf functions (#145862)
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Commits on Dec 23, 2025

[-Wunsafe-buffer-usage] Do not warn about class methods with libc function names (#151270)
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[clang][BufferUsage] Fix crash when parsing invalid format string (#170496)

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