analyzer: respect GCC_COLORS in out-of-bounds diagrams [PR114588]

analyzer: respect GCC_COLORS in out-of-bounds diagrams [PR114588]

gcc/analyzer/ChangeLog:
	PR analyzer/114588
	* access-diagram.cc (access_diagram_impl::access_diagram_impl):
	Replace hardcoded colors for valid_style and invalid_style with
	calls to text_art::get_style_from_color_cap_name.

gcc/ChangeLog:
	PR analyzer/114588
	* diagnostic-color.cc (color_dict): Add "valid" and "invalid" as
	color capability names.
	* doc/invoke.texi: Document them in description of GCC_COLORS.
	* text-art/style.cc: Include "diagnostic-color.h".
	(text_art::get_style_from_color_cap_name): New.
	* text-art/types.h (get_style_from_color_cap_name): New decl.

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