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from 7b9a1f91efe phiopt: Fix value_replacement for middle bb having phi node [...] new bbca95724c6 libstdc++: Document thread-safety for COW std::string [PR21334]

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Summary of changes: libstdc++-v3/doc/html/manual/using_concurrency.html | 10 ++++++++++ libstdc++-v3/doc/xml/manual/using.xml | 12 ++++++++++++ 2 files changed, 22 insertions(+)