Remove AND_HARD_REG_SET

Use "x &= y" instead of "AND_HARD_REG_SET (x, y)" (or just "x & y"
if the result is a temporary).

2019-09-09  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* hard-reg-set.h (HARD_REG_SET::operator&): New function.
	(HARD_REG_SET::operator&): Likewise.
	(AND_HARD_REG_SET): Delete.
	* caller-save.c (setup_save_areas): Use "&" instead of
	AND_HARD_REG_SET.
	(save_call_clobbered_regs): Likewise.
	* config/gcn/gcn.c (gcn_md_reorg): Likewise.
	* config/m32c/m32c.c (reduce_class): Likewise.
	* config/rs6000/rs6000.c (rs6000_register_move_cost): Likewise.
	* final.c (get_call_reg_set_usage): Likewise.
	* ira-color.c (add_allocno_hard_regs_to_forest): Likewise.
	(setup_left_conflict_sizes_p): Likewise.
	* ira-conflicts.c (print_allocno_conflicts): Likewise.
	(ira_build_conflicts): Likewise.
	* ira-costs.c (restrict_cost_classes): Likewise.
	* ira.c (setup_stack_reg_pressure_class, setup_class_translate_array)
	(setup_reg_class_relations): Likewise.
	* reginfo.c (init_reg_sets_1, record_subregs_of_mode): Likewise.
	* reload1.c (maybe_fix_stack_asms, finish_spills): Likewise.
	* resource.c (find_dead_or_set_registers): Likewise.
	* sel-sched.c (mark_unavailable_hard_regs): Likewise.

From-SVN: r275530