Protect second call to extract_range_from_multiplicative_op_1

Protect second call to extract_range_from_multiplicative_op_1

Following on from:

        * tree-vrp.c (extract_range_from_multiplicative_op_1): Assert
        for VR_RANGE only; don't allow VR_ANTI_RANGE.
        (extract_range_from_binary_expr_1): Don't call
        extract_range_from_multiplicative_op_1 if !range_int_cst_p.

there was a later call to extract_range_from_multiplicative_op_1 too,
that used a negative test for a symbolic (!is_gimple_min_invariant)
range rather than a positive test for an integer range.

2017-11-04  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* tree-vrp.c (extract_range_from_binary_expr_1): Check
	range_int_cst_p rather than !symbolic_range_p before calling
	extract_range_from_multiplicative_op_1.

From-SVN: r256262