analyzer: remove dead code

analyzer: remove dead code

gcc/analyzer/ChangeLog:

	* constraint-manager.cc (constraint_manager::merge): Remove
	unused code.
	* constraint-manager.h: Likewise.
	* program-state.cc (sm_state_map::sm_state_map): Likewise.
	(program_state::program_state): Likewise.
	(test_sm_state_map): Likewise.
	* program-state.h: Likewise.
	* region-model-reachability.cc (reachable_regions::reachable_regions): Likewise.
	* region-model-reachability.h: Likewise.
	* region-model.cc (region_model::handle_unrecognized_call): Likewise.
	(region_model::get_reachable_svalues): Likewise.
	(region_model::can_merge_with_p): Likewise.