PR rtl-optimization/47299
	* expr.c (expand_expr_real_2) <case WIDEN_MULT_EXPR>: Don't use
	subtarget.  Use normal multiplication if both operands are
	constants.
	* expmed.c (expand_widening_mult): Don't try to optimize constant
	multiplication if op0 has VOIDmode.  Convert op1 constant to mode
	before using it.

	* gcc.c-torture/execute/pr47299.c: New test.

From-SVN: r168944