basic_string.h (operator+(basic_string<>&&, const basic_string<>&), [...]): Add.

2010-12-17  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/basic_string.h (operator+(basic_string<>&&,
	const basic_string<>&), operator+(const basic_string<>&,
	basic_string<>&&), operator+(basic_string<>&&, basic_string<>&&),
	operator+(const _CharT*, basic_string<>&&), operator+(_CharT,
	basic_string<>&&), operator+(basic_string<>&&, const _CharT*),
	operator+(basic_string<>&&, _CharT)): Add.
	* testsuite/21_strings/basic_string/operators/char/3.cc: New.
	* testsuite/21_strings/basic_string/operators/wchar_t/3.cc: Likewise.

From-SVN: r167994