re PR tree-optimization/32461 (Segmentation fault in build_classic_dist_vector_1() at tree-data-ref.c:2700)

	PR middle-end/32461
	* fold-const.c (fold_binary): Strip nops of operand 0
	of BIT_NOT_EXPR before calling operand_equal_p.
	* testsuite/gcc.dg/tree-ssa/pr32461-1.c: New.
	* testsuite/gcc.dg/tree-ssa/pr32461-2.c: New.

From-SVN: r125988