PR driver/69265 and 69453: improved suggestions for various misspelled options

PR driver/69265 and 69453: improved suggestions for various misspelled options

gcc/ChangeLog:
	PR driver/69265
	PR driver/69453
	* gcc.c (driver::driver): Initialize m_option_suggestions.
	(driver::~driver): Clean up m_option_suggestions.
	(suggest_option): Convert to...
	(driver::suggest_option): ...this, and split out into
	driver::build_option_suggestions and find_closest_string.
	(driver::build_option_suggestions): New function, from
	first half of suggest_option.  Special-case
	OPT_fsanitize_ and OPT_fsanitize_recover_, making use of
	the sanitizer_opts array.  For options of enum types, add the
	various enum values to the candidate strings.
	(driver::handle_unrecognized_options): Remove "const".
	* gcc.h (driver::handle_unrecognized_options): Likewise.
	(driver::build_option_suggestions): New decl.
	(driver::suggest_option): New decl.
	(driver::m_option_suggestions): New field.
	* opts-common.c (add_misspelling_candidates): New function.
	* opts.c (sanitizer_opts): Remove decl of struct sanitizer_opts_s
	and make non-static.
	* opts.h (sanitizer_opts): New array decl.
	(add_misspelling_candidates): New function decl.
	* spellcheck.c (find_closest_string): New function.
	* spellcheck.h (find_closest_string): New function decl.

gcc/testsuite/ChangeLog:
	PR driver/69265
	PR driver/69453
	* gcc.dg/spellcheck-options-3.c: New test case.
	* gcc.dg/spellcheck-options-4.c: New test case.
	* gcc.dg/spellcheck-options-5.c: New test case.
	* gcc.dg/spellcheck-options-6.c: New test case.
	* gcc.dg/spellcheck-options-7.c: New test case.
	* gcc.dg/spellcheck-options-8.c: New test case.
	* gcc.dg/spellcheck-options-9.c: New test case.
	* gcc.dg/spellcheck-options-10.c: New test case.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@233382 138bc75d-0d04-0410-961f-82ee72b054a4