gdb/mi: Add new commands -symbol-info-{functions,variables,types}

gdb/mi: Add new commands -symbol-info-{functions,variables,types}

Add new MI commands -symbol-info-functions, -symbol-info-variables,
and -symbol-info-types which correspond to the CLI commands 'info
functions', 'info variables', and 'info types' respectively.

gdb/ChangeLog:

	* mi/mi-cmds.c (mi_cmds): Add '-symbol-info-functions',
	'-symbol-info-types', and '-symbol-info-variables'.
	* mi/mi-cmds.h (mi_cmd_symbol_info_functions): Declare.
	(mi_cmd_symbol_info_types): Declare.
	(mi_cmd_symbol_info_variables): Declare.
	* mi/mi-symbol-cmds.c: Add 'source.h' and 'mi-getopt.h' includes.
	(output_debug_symbol): New function.
	(output_nondebug_symbol): New function.
	(mi_symbol_info): New function.
	(mi_info_functions_or_variables): New function.
	(mi_cmd_symbol_info_functions): New function.
	(mi_cmd_symbol_info_types): New function.
	(mi_cmd_symbol_info_variables): New function.
	* NEWS: Mention new commands.

gdb/testsuite/ChangeLog:

	* gdb.mi/mi-sym-info-1.c: New file.
	* gdb.mi/mi-sym-info-2.c: New file.
	* gdb.mi/mi-sym-info.exp: New file.

gdb/doc/ChangeLog:

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

Change-Id: Ic2fc6a6750bbce91cdde2344791014e5ef45642d