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git pushed a change to branch gcc-6-branch in repository gcc.

from 2d51ac7a621 Daily bump. new eca085d345c Daily bump. new 92876389b25 PR libstdc++/87704 fix unique_ptr(nullptr_t) constructors new d1c2b61ae4e PR libstdc++/87749 fix (and optimize) string move construction

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Summary of changes: gcc/DATESTAMP | 2 +- libstdc++-v3/ChangeLog | 30 ++++++++ libstdc++-v3/include/bits/basic_string.h | 21 ++++-- libstdc++-v3/include/bits/unique_ptr.h | 8 ++- .../20_util/unique_ptr/assign/48635_neg.cc | 4 +- .../20_util/unique_ptr/cons/cv_qual_neg.cc | 2 +- .../86751.cc => unique_ptr/cons/incomplete.cc} | 19 +++--- .../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 +++--- 11 files changed, 245 insertions(+), 42 deletions(-) copy libstdc++-v3/testsuite/20_util/{pair/86751.cc => unique_ptr/cons/incomplete.c [...] 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 [...]