Introduce gcc_rich_location::add_fixit_misspelled_id

Introduce gcc_rich_location::add_fixit_misspelled_id

gcc/c/ChangeLog:
	* c-typeck.c (build_component_ref): Simplify fixit code by
	using gcc_rich_location::add_fixit_misspelled_id.
	(set_init_label): Likewise.

gcc/cp/ChangeLog:
	* typeck.c: Include "gcc-rich-location.h".
	(finish_class_member_access_expr): Simplify fixit code by
	using gcc_rich_location::add_fixit_misspelled_id.

gcc/ChangeLog:
	* gcc-rich-location.c
	(gcc_rich_location::add_fixit_misspelled_id): New method.
	* gcc-rich-location.h
	(gcc_rich_location::add_fixit_misspelled_id): Add decl.

From-SVN: r237463