ipa: Remove ipa_bits

ipa: Remove ipa_bits

The following patch removes ipa_bits struct pointer/vector from ipa
jump functions and ipa cp transformations.

The reason is because the struct uses widest_int to represent
mask/value pair, which in the RFC patches to allow larger precisions
for wide_int/widest_int is GC unfriendly because those types become
non-trivially default constructible/copyable/destructible.
One option would be to use trailing_wide_int for that instead, but
as pointed out by Aldy, irange_storage which we already use under
the hood for ipa_vr when type of parameter is integral or pointer
already stores the mask/value pair because VRP now does the bit cp
as well.
So, this patch just uses m_vr to store both the value range and
the bitmask.  There is still separate propagation of the
ipcp_bits_lattice from propagation of the ipcp_vr_lattice, but
when storing we merge the two into the same container.

2023-10-06  Jakub Jelinek  <jakub@redhat.com>

	* ipa-prop.h (ipa_bits): Remove.
	(struct ipa_jump_func): Remove bits member.
	(struct ipcp_transformation): Remove bits member, adjust
	ctor and dtor.
	(ipa_get_ipa_bits_for_value): Remove.
	* ipa-prop.cc (struct ipa_bit_ggc_hash_traits): Remove.
	(ipa_bits_hash_table): Remove.
	(ipa_print_node_jump_functions_for_edge): Don't print bits.
	(ipa_get_ipa_bits_for_value): Remove.
	(ipa_set_jfunc_bits): Remove.
	(ipa_compute_jump_functions_for_edge): For pointers query
	pointer alignment before ipa_set_jfunc_vr and update_bitmask
	in there.  For integral types, just rely on bitmask already
	being handled in value ranges.
	(ipa_check_create_edge_args): Don't create ipa_bits_hash_table.
	(ipcp_transformation_initialize): Neither here.
	(ipcp_transformation_t::duplicate): Don't copy bits vector.
	(ipa_write_jump_function): Don't stream bits here.
	(ipa_read_jump_function): Neither here.
	(useful_ipcp_transformation_info_p): Don't test bits vec.
	(write_ipcp_transformation_info): Don't stream bits here.
	(read_ipcp_transformation_info): Neither here.
	(ipcp_get_parm_bits): Get mask and value from m_vr rather
	than bits.
	(ipcp_update_bits): Remove.
	(ipcp_update_vr): For pointers, set_ptr_info_alignment from
	bitmask stored in value range.
	(ipcp_transform_function): Don't test bits vector, don't call
	ipcp_update_bits.
	* ipa-cp.cc (propagate_bits_across_jump_function): Don't use
	jfunc->bits, instead get mask and value from jfunc->m_vr.
	(ipcp_store_bits_results): Remove.
	(ipcp_store_vr_results): Incorporate parts of
	ipcp_store_bits_results here, merge the bitmasks with value
	range if both are supplied.
	(ipcp_driver): Don't call ipcp_store_bits_results.
	* ipa-sra.cc (zap_useless_ipcp_results): Remove *ts->bits
	clearing.