fold-const.c (fold): Reassociate (+ (+ (* a b) c) (* d e)) as (+ (+ (* a b) (* d e)) c).

        * fold-const.c (fold): Reassociate (+ (+ (* a b) c) (* d e))
        as (+ (+ (* a b) (* d e)) c).  Factor a common power-of-two
        multiplicand out of (+ (* a b) (* c d)).

From-SVN: r28829