* c.opt (Wredundant-move): New option.

	* typeck.c (treat_lvalue_as_rvalue_p): New function.
	(maybe_warn_pessimizing_move): Call convert_from_reference.
	Warn about redundant moves.

	* doc/invoke.texi: Document -Wredundant-move.

	* g++.dg/cpp0x/Wredundant-move1.C: New test.
	* g++.dg/cpp0x/Wredundant-move2.C: New test.
	* g++.dg/cpp0x/Wredundant-move3.C: New test.
	* g++.dg/cpp0x/Wredundant-move4.C: New test.

From-SVN: r263863