gdb/mi: Add -symbol-info-module-{variables,functions}

gdb/mi: Add -symbol-info-module-{variables,functions}

Two new MI command -symbol-info-module-variables and
-symbol-info-module-functions, which are the equivalent of the CLI
command 'info module variables' and 'info module functions'.  These
return information about functions and variables within Fortran
modules.

gdb/ChangeLog:

	* mi/mi-cmds.c (mi_cmds): Add -symbol-info-module-functions and
	-symbol-info-module-variables entries.
	* mi/mi-cmds.h (mi_cmd_symbol_info_module_functions): Declare.
	(mi_cmd_symbol_info_module_variables): Declare.
	* mi/mi-symbol-cmds.c
	(module_symbol_search_iterator): New typedef.
	(output_module_symbols_in_single_module_and_file): New function.
	(output_module_symbols_in_single_module): New function.
	(mi_info_module_functions_or_variables): New function.
	(mi_cmd_symbol_info_module_functions): New function.
	(mi_cmd_symbol_info_module_variables): New function.
	* NEWS: Mention new MI command.

gdb/doc/ChangeLog:

	* doc/gdb.texinfo (GDB/MI Symbol Query): Document new MI command
	-symbol-info-module-functions and -symbol-info-module-variables.

gdb/testsuite/ChangeLog:

	* gdb.mi/mi-fortran-modules.exp: Add additional tests for
	-symbol-info-module-functions and -symbol-info-module-variables.

Change-Id: Ic96f12dd14bd7e34774c3cde008fec30a4055bfe