PR rtl-optimization/55177
	* simplify-rtx.c (simplify_unary_operation_1) <NOT>: Deal with BSWAP.
	(simplify_byte_swapping_operation): New.
	(simplify_binary_operation_1): Call it for AND, IOR and XOR.
	(simplify_relational_operation_1): Deal with BSWAP.

From-SVN: r199278