tree-chrec.c (evolution_function_is_invariant_rec_p): Use CHREC_LEFT and CHREC_RIGHT for accessing chrec components instead of...

	* tree-chrec.c (evolution_function_is_invariant_rec_p): Use
	CHREC_LEFT and CHREC_RIGHT for accessing chrec components instead
	of wrongly accessing operands.

From-SVN: r104093