RISC-V: Allow errors to be suppressed when parsing architectures

One of Alfie's FMV patches adds a hook that, in some cases,
is used to silently query a target_version (with no diagnostics
expected).  In the review, I'd suggested handling this using
a location_t *, with null meaning "suppress diagnostics":

   https://gcc.gnu.org/pipermail/gcc-patches/2025-August/692113.html

This patch tries to propagate that through the RISC-V parsing code.
I realise this isn't very elegant, sorry.

I think riscv_compare_version_priority should also logically suppress
diagnostics, since it's supposed to be a pure query function.  (From
that point of view, advocating for this change for Alfie's patch might
have been a bit unfair.)

gcc/
	* config/riscv/riscv-protos.h
	(riscv_process_target_version_attr): Change location_t argument
	to location_t *.
	* config/riscv/riscv-subset.h
	(riscv_subset_list::riscv_subset_list): Change location_t argument
	to location_t *.
	(riscv_subset_list::parse): Likwise.
	(riscv_subset_list::set_loc): Likewise.
	(riscv_minimal_hwprobe_feature_bits): Likewise.
	(riscv_subset_list::m_loc): Change type to location_t.
	* common/config/riscv/riscv-common.cc
	(riscv_subset_list::riscv_subset_list): Change location_t argument
	to location_t *.
	(riscv_subset_list::add): Suppress diagnostics when m_loc is null.
	(riscv_subset_list::parsing_subset_version): Likewise.
	(riscv_subset_list::parse_profiles): Likewise.
	(riscv_subset_list::parse_base_ext): Likewise.
	(riscv_subset_list::parse_single_std_ext): Likewise.
	(riscv_subset_list::check_conflict_ext): Likewise.
	(riscv_subset_list::parse_single_multiletter_ext): Likewise.
	(riscv_subset_list::parse): Change location_t argument to location_t *.
	(riscv_subset_list::set_loc): Likewise.
	(riscv_minimal_hwprobe_feature_bits): Likewise.
	(riscv_parse_arch_string): Update call accordingly.
	* config/riscv/riscv-target-attr.cc
	(riscv_target_attr_parser::m_loc): Change type to location_t *.
	(riscv_target_attr_parser::riscv_target_attr_parser): Change
	location_t argument to location_t *.
	(riscv_process_one_target_attr): Likewise.
	(riscv_process_target_attr): Likewise.
	(riscv_process_target_version_attr): Likewise.
	(riscv_target_attr_parser::parse_arch): Suppress diagnostics when
	m_loc is null.
	(riscv_target_attr_parser::handle_arch): Likewise.
	(riscv_target_attr_parser::handle_cpu): Likewise.
	(riscv_target_attr_parser::handle_tune): Likewise.
	(riscv_target_attr_parser::handle_priority): Likewise.
	(riscv_option_valid_attribute_p): Update call accordingly.
	(riscv_option_valid_version_attribute_p): Likewise.
	* config/riscv/riscv.cc (parse_features_for_version): Add a
	location_t * argument.
	(dispatch_function_versions): Update call accordingly.
	(riscv_compare_version_priority): Likewise, suppressing diagnostics.

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