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from 9f5819d1e60 Daily bump. new 3657e124053 Daily bump. new d3a941337da PR libstdc++/87749 fix (and optimize) string move construction

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Summary of changes: gcc/DATESTAMP | 2 +- libstdc++-v3/ChangeLog | 16 +++++ libstdc++-v3/include/bits/basic_string.h | 21 ++++-- .../basic_string/modifiers/assign/char/87749.cc | 78 +++++++++++++++++++++ .../modifiers/assign/char/move_assign_optim.cc} | 22 +++--- .../basic_string/modifiers/assign/wchar_t/87749.cc | 79 ++++++++++++++++++++++ .../modifiers/assign/wchar_t/move_assign_optim.cc} | 22 +++--- 7 files changed, 213 insertions(+), 27 deletions(-) create mode 100644 libstdc++-v3/testsuite/21_strings/basic_string/modifiers/assign [...] copy libstdc++-v3/testsuite/{20_util/pair/86751.cc => 21_strings/basic_string/modi [...] create mode 100644 libstdc++-v3/testsuite/21_strings/basic_string/modifiers/assign [...] copy libstdc++-v3/testsuite/{20_util/pair/86751.cc => 21_strings/basic_string/modi [...]