[2/2] Add AddressSanitizer annotations to std::string.

[Mikhail Kashkarov]

Add AddressSanitizer annotations to std::string.

 Â Â Â  * include/bits/basic_string.h [_GLIBCXX_USE_DUAL_ABI]
 Â Â Â  (_GLIBCXX_SANITIZER_ANNOTATE_STRING): Define.
 Â Â Â  (_GLIBCXX_SANITIZER_ALIGN): Define.
 Â Â Â  (_asan_traits<_CharT, _Alloc>, _asan_traits<_CharT, allocator<_CharT>)
 Â Â Â  (_asan_traits::__annotate_delete, _asan_traits::__annotate_new)
 Â Â Â  (_asan_traits::__annotate_grow): New traits for annotation.
(basic_string::__RAII_IncreaseAnnotator::__RAII_Increaseannotator)
 Â Â Â  (basic_string::__RAII_IncreaseAnnotator::done)
(basic_string::__RAII_IncreaseAnnotator::~RAII_Increaseannotator):
 Â Â Â  New annotation helpers in case of exceptions.
 Â Â Â  (basic_string::__get_beg, basic_string::__get_mid)
 Â Â Â  (basic_string::__get_end): New annotation helpers.
 Â Â Â  (basis_string::_M_dispose, basic_string::_M_destroy)
 Â Â Â  (basic_string::basic_string(basic_string&& __str))
 Â Â Â  (basic_string::basic_string(basic_string&& __str, const _Alloc& __a))
 Â Â Â  (basic_string::operator=(constbasic_string& __str))
 Â Â Â  (basic_string::operator=(basic_string&& __str))
 Â Â Â  (basic_string::clear, basic_string::push_back): Annotate.
 Â Â Â  [!_GLIBCXX_USE_DUAL_ABI]
 Â Â Â  (_asan_traits<_CharT, _Alloc>, _asan_traits<_CharT, allocator<_CharT>)
 Â Â Â  (_asan_traits::__annotate_delete, _asan_traits::__annotate_new)
 Â Â Â  (_asan_traits::__annotate_grow): New traits for annotation.
(basic_string::__RAII_IncreaseAnnotator::__RAII_Increaseannotator)
 Â Â Â  (basic_string::__RAII_IncreaseAnnotator::done)
(basic_string::__RAII_IncreaseAnnotator::~RAII_Increaseannotator):
 Â Â Â  New annotation helpers in case of exceptions.
 Â Â Â  (basic_string::__get_beg, basic_string::__get_mid)
 Â Â Â  (basic_string::__get_end): New annotation helpers.
 Â Â Â  (basic_string::_Rep_base): Align by 8 when annotations are anabled.
 Â Â Â  (basic_string::push_back): Annotate
 Â Â Â  * include/bits/basic_string.tcc [_GLIBCXX_USE_DUAL_ABI]
 Â Â Â  (basic_string::swap, basic_string::_M_construct)
 Â Â Â  (basic_string::_M_assign, basic_string::reserve)
 Â Â Â  (basic_string::_M_mutate, basic_string::_M_erase)
 Â Â Â  (basic_string::resize, basic_string::_M_append)
 Â Â Â  (basic_string::_M_replace): Annotate.
 Â Â Â  [!_GLIBCXX_USE_DUAL_ABI]
 Â Â Â  (basic_string::_S_construct)
 Â Â Â  (basic_string::append(const _CharT* __s, size_type __n))
 Â Â Â  (basic_string::append(const basic_string& __str))
 Â Â Â  (basic_string::_M_destroy, basic_string::_M_mutate)
 Â Â Â  (basic_string::_S_create, basic_string::_M_clone): Annotate.
 Â Â Â  [_GLIBCXX_SANITIZE_STRING]
 Â Â Â  Disable template implicit instantiation declarations for annotations.
 Â Â Â  * libstdc++-v3/include/bits/sstream.tcc
 Â Â Â  (basic_stringbuf::overflow, basic_stringbuf::_M_sync): Annotate
 Â Â Â  Disable template implicit instantiation declarations for annotations.
 Â Â Â  * libstdc++-v3/include/bits/locale_facets.tcc:
 Â Â Â  Disable template implicit instantiation declarations for annotations.
 Â Â Â  * libstdc++-v3/include/bits/fstream.tcc: Likewise.

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