* predict.h (PROB_LIKELY): Fix the value.
	* internal-fn.c (ubsan_expand_si_overflow_mul_check): Add support
	for overflow checking for modes without 2xwider supported mode,
	if the mode has 2xnarrower mode.

	* c-c++-common/ubsan/overflow-mul-3.c: New test.
	* c-c++-common/ubsan/overflow-mul-4.c: New test.

From-SVN: r206026