Support for 64-bit location_t: C++ modules parts

Support for 64-bit location_t: C++ modules parts

The modules implementation is necessarily sensitive to the internal workings
of class line_map, and so it needed changes in order to handle a 64-bit
location_t. The changes mostly boil down to supporting that in the debug
dumping routines (which is accomplished by using a new custom code %K for
that purpose), and supporting that when streaming in and out from the
module (which is accomplished by using a new loc() function to go along with
existing abstractions like u() or z() for streaming in and out different
data types).

gcc/cp/ChangeLog:

	* module.cc (bytes_out::loc): New function.
	(bytes_in::loc): New function.
	(struct span): Change int fields to location_diff_t.
	(range_t): Change from "unsigned int" to "line_map_uint_t".
	(struct ord_loc_info): Likewise.
	(struct macro_loc_info): Likewise.
	(class module_state): Likewise.
	(dumper::operator()): Add new code 'K' for dumping a location_t.
	(loc_spans::init): Use %K instead of %u for location_t dumps.
	(loc_spans::open): Likewise.
	(loc_spans::close): Likewise. Adjust bitwise expressions to support
	64-bit location_t as well.
	(struct module_state_config): Change ordinary_locs and macro_locs
	from "unsigned int" to "line_map_uint_t".  Reorder fields to improve
	packing.  Rather than changing the constructor initializer list to
	match the new order, switch to NSDMI instead.
	(module_state::note_location): Adjust to support 64-bit location_t.
	(module_state::write_location): Use %K instead of %u for location_t
	dumps. Use loc() instead of u() for streaming location_t.
	(module_state::read_location): Likewise.
	(module_state::write_ordinary_maps): Likewise.
	(module_state::write_macro_maps): Likewise.
	(module_state::write_config): Likewise.
	(module_state::read_config): Likewise.
	(module_state::write_prepare_maps): Use %K instead of %u for
	location_t dumps. Adjust variable types and bitwise expressions to
	support 64-bit location_t.
	(module_state::read_ordinary_maps): Likewise.
	(module_state::read_macro_maps): Likewise.
	(preprocess_module): Adjust data types to support 64-bit number of
	line maps.