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from 319a956cd25 Refactor mgather/mscatter implementation. new 89552346e3c libstdc++: Fix std::counting_semaphore<> default max value new d07b9e7fe42 libstdc++: Future-proof C++20 atomic wait/notify

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Summary of changes: libstdc++-v3/config/abi/pre/gnu.ver | 2 +- libstdc++-v3/include/bits/atomic_timed_wait.h | 20 +- libstdc++-v3/include/bits/atomic_wait.h | 157 +++++++++----- libstdc++-v3/include/bits/semaphore_base.h | 14 +- libstdc++-v3/src/c++20/atomic.cc | 240 ++++++++++++--------- .../semaphore/{cons.cc => least_max_value.cc} | 6 +- 6 files changed, 269 insertions(+), 170 deletions(-) copy libstdc++-v3/testsuite/30_threads/semaphore/{cons.cc => least_max_value.cc} (53%)