re PR tree-optimization/83523 (ICE: verify_gimple failed (error: statement marked for throw, but doesn't))

	PR tree-optimization/83523
	* tree-ssa-math-opts.c (is_widening_mult_p): Return false if
	for INTEGER_TYPE TYPE_OVERFLOW_TRAPS.
	(convert_mult_to_fma): Likewise.

	* g++.dg/tree-ssa/pr83523.C: New test.

From-SVN: r255953