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from a52bf016433 c++: using-decl instantiation new 93e79ed391b libstdc++: Rewrite std::call_once to use futexes [PR 66146]

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Summary of changes: libstdc++-v3/config/abi/pre/gnu.ver | 5 + libstdc++-v3/include/std/mutex | 200 +++++++++++++++++---- libstdc++-v3/src/c++11/mutex.cc | 59 ++++++ .../testsuite/30_threads/call_once/39909.cc | 3 +- .../testsuite/30_threads/call_once/49668.cc | 4 +- .../testsuite/30_threads/call_once/60497.cc | 4 +- .../30_threads/call_once/{dr2442.cc => 66146.cc} | 35 ++-- .../testsuite/30_threads/call_once/call_once1.cc | 6 +- .../testsuite/30_threads/call_once/constexpr.cc | 29 --- .../testsuite/30_threads/call_once/dr2442.cc | 4 +- .../testsuite/30_threads/call_once/once_flag.cc | 10 +- .../30_threads/once_flag/cons/constexpr.cc | 29 --- 12 files changed, 264 insertions(+), 124 deletions(-) copy libstdc++-v3/testsuite/30_threads/call_once/{dr2442.cc => 66146.cc} (66%) delete mode 100644 libstdc++-v3/testsuite/30_threads/call_once/constexpr.cc delete mode 100644 libstdc++-v3/testsuite/30_threads/once_flag/cons/constexpr.cc