c-ubsan.c (ubsan_instrument_bounds): Don't skip instrumenting flexible member array-like members if...

	* c-ubsan.c (ubsan_instrument_bounds): Don't skip instrumenting
	flexible member array-like members if SANITIZE_BOUNDS_STRICT.

	* doc/invoke.texi: Document -fsanitize=bounds-strict.
	* flag-types.h (enum sanitize_code): Add SANITIZE_BOUNDS_STRICT, or it
	into SANITIZE_NONDEFAULT.
	* opts.c (common_handle_option): Handle -fsanitize=bounds-strict.

	* c-c++-common/ubsan/bounds-10.c: New test.

From-SVN: r222871