2010-12-19  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/basic_string.h (operator+(basic_string<>&&,
	basic_string<>&&)): Optimize better.
	* include/ext/vstring.h (operator+(__versa_string<>&&,
	__versa_string<>&)): Likewise.

From-SVN: r168061