Add [-q] [-t TYPEREGEXP] [NAMEREGEXP] args to info [args|functions|locals|variables]

Add [-q] [-t TYPEREGEXP] [NAMEREGEXP] args to info [args|functions|locals|variables]

Add [-q] [-t TYPEREGEXP] [NAMEREGEXP] args to info [args|functions|locals|variables]

Main changes are:
* stack.c: Add two regexp preg and treg to print_variable_and_value_data
  and used them inside do_print_variable_and_value to filter the
  variables to print.

* symtab.h: Add a new function bool treg_matches_sym_type_name, that
  factorises type matching logic.

* symtab.c: Add type/name matching logic to 'info functions|variables'.

* stack.c : Add type/name matching logic to 'info args|locals'.

gdb/ChangeLog
2018-10-27  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* stack.c (print_variable_and_value_data): Add preg and treg.
	(print_frame_local_vars): Add quiet, regexp and t_regexp arguments,
	and update callers.
	(print_frame_arg_vars): Likewise.
	(prepare_reg): New function.
	(info_locals_command): Extract info print args and use them.
	(info_args_command): Likewise.
	(_initialize_stack): Modify on-line help.
	* symtab.c (treg_matches_sym_type_name): New function.
	(search_symbols): New arg t_regexp.
	(symtab_symbol_info): New args quiet, regexp, t_regexp.
	(info_variables_command): Extract info print args and use them.
	(info_functions_command): Likewise.
	(info_types_command): Update call to symtab_symbol_info.
	(_initialize_symtab): Modify on-line help.
	* symtab.h (treg_matches_sym_type_name): New function.
	(search_symbols): New t_regexp arg.