more uses for swap_commutative_operands_p

[Richard Kenner]

    Thu May 17 21:42:27 CEST 2001  Jan Hubicka  <jh@suse.cz>

	* combine.c (combine_simplify_rtx): Use swap_commutative_operands_p.
	(gen_binary): Likewise.
	* optabs.c (emit_cmp_and_jump_insns, emit_conditional_move): Likewise.
	* simplify-rtx.c (simplify_gen_binary, simplify_gen_relational): Likewise.

This is OK, but fix the above too-long ChangeLog line.