The various decls relating to rich_location are in
libcpp/include/line-map.h, but they don't relate to line maps.

Split them out to their own header: libcpp/include/rich-location.h

No functional change intended.

gcc/ChangeLog:
	* Makefile.in (CPPLIB_H): Add libcpp/include/rich-location.h.
	* coretypes.h (class rich_location): New forward decl.

gcc/analyzer/ChangeLog:
	* analyzer.h: Include "rich-location.h".

gcc/c-family/ChangeLog:
	* c-lex.cc: Include "rich-location.h".

gcc/cp/ChangeLog:
	* mapper-client.cc: Include "rich-location.h".

gcc/ChangeLog:
	* diagnostic.h: Include "rich-location.h".
	* edit-context.h (class fixit_hint): New forward decl.
	* gcc-rich-location.h: Include "rich-location.h".
	* genmatch.cc: Likewise.
	* pretty-print.h: Likewise.

gcc/rust/ChangeLog:
	* rust-location.h: Include "rich-location.h".

libcpp/ChangeLog:
	* Makefile.in (TAGS_SOURCES): Add "include/rich-location.h".
	* include/cpplib.h (class rich_location): New forward decl.
	* include/line-map.h (class range_label)
	(enum range_display_kind, struct location_range)
	(class semi_embedded_vec, class rich_location, class label_text)
	(class range_label, class fixit_hint): Move to...
	* include/rich-location.h: ...this new file.
	* internal.h: Include "rich-location.h".

Signed-off-by: David Malcolm <dmalcolm@redhat.com>