[PATCH] libstdc++: Add a __nonnnull__ attribute to std::string's _CharT* constructor

[Ville Voutilainen]

2020-06-28  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Add a __nonnnull__ attribute to std::string's _CharT* constructor
    * include/bits/basic_string.h (string(_CharT*, const _Alloc&)):
    Add a __nonnull__ attribute.
    * testsuite/21_strings/basic_string/cons/char/nonnull.cc: New.
    * testsuite/21_strings/basic_string/cons/wchar_t/nonnull.cc: Likewise.
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