Use function view in quick_symbol_functions::map_symbol_filenames

Use function view in quick_symbol_functions::map_symbol_filenames

This changes quick_symbol_functions::map_symbol_filenames to use a
function_view, and updates all the uses.  It also changes the final
parameter to 'bool'.  A couple of spots are further updated to use
operator() rather than a lambda.

gdb/ChangeLog
2021-03-26  Tom Tromey  <tom@tromey.com>

	* symtab.c (struct output_source_filename_data): Add 'output'
	method and operator().
	(output_source_filename_data::output): Rename from
	output_source_filename.
	(output_partial_symbol_filename): Remove.
	(info_sources_command): Update.
	(struct add_partial_filename_data): Add operator().
	(add_partial_filename_data::operator()): Rename from
	maybe_add_partial_symtab_filename.
	(make_source_files_completion_list): Update.
	* symfile.c (quick_symbol_functions): Update.
	* symfile-debug.c (objfile::map_symbol_filenames): Update.
	* quick-symbol.h (symbol_filename_ftype): Change type of 'fun' and
	'need_fullname'.  Remove 'data' parameter.
	(struct quick_symbol_functions) <map_symbol_filenames>: Likewise.
	* psymtab.c (psymbol_functions::map_symbol_filenames): Update.
	* psympriv.h (struct psymbol_functions) <map_symbol_filenames>:
	Change type of 'fun' and 'need_fullname'.  Remove 'data'
	parameter.
	* objfiles.h (struct objfile) <map_symbol_filenames>: Change type
	of 'fun' and 'need_fullname'.  Remove 'data' parameter.
	* mi/mi-cmd-file.c (print_partial_file_name): Remove 'ignore'
	parameter.
	(mi_cmd_file_list_exec_source_files): Update.
	* dwarf2/read.c
	(dwarf2_base_index_functions::map_symbol_filenames): Update.