Support for 64-bit location_t: Internal parts

Support for 64-bit location_t: Internal parts

Several of the selftests in diagnostic-show-locus.cc and input.cc are
sensitive to linemap internals. Adjust them here so they will support 64-bit
location_t if configured.

Likewise, handle 64-bit location_t in the support for
-fdump-internal-locations. As was done with the analyzer, convert to
(unsigned long long) explicitly so that 32- and 64-bit can be handled with
the same printf formats.

gcc/ChangeLog:

	* diagnostic-show-locus.cc
	(test_one_liner_fixit_validation_adhoc_locations): Adapt so it can
	effectively test 7-bit ranges instead of 5-bit ranges.
	(test_one_liner_fixit_validation_adhoc_locations_utf8): Likewise.
	* input.cc (get_end_location): Adjust types to support 64-bit
	location_t.
	(write_digit_row): Likewise.
	(dump_location_range): Likewise.
	(dump_location_info): Likewise.
	(class line_table_case): Likewise.
	(test_accessing_ordinary_linemaps): Replace some hard-coded
	constants with the values defined in line-map.h.
	(for_each_line_table_case): Likewise.