* tree-ssa-phiopts.c (rhs_is_fed_for_value_replacement): New function.
	(operand_equal_for_value_replacement): New function, extracted from
	value_replacement and enhanced to catch more cases.
	(value_replacement): Use operand_equal_for_value_replacement.

	* gcc.dg/tree-ssa/phi-opt-11.c: New test.

From-SVN: r203327