c-parser.c (c_parser_switch_statement): Add IF_P argument, parse it through to c_parser_c99_block_statement.

	* c-parser.c (c_parser_switch_statement): Add IF_P argument,
	parse it through to c_parser_c99_block_statement.
	(c_parser_statement_after_labels): Adjust c_parser_switch_statement
	caller.

	* parser.c (cp_parser_selection_statement): For RID_SWITCH,
	pass if_p instead of NULL to cp_parser_implicitly_scoped_statement.

	* c-c++-common/Wdangling-else-4.c: New test.

From-SVN: r235920