This fixes at least one case of performance regression in 7.0, and
is nice win on nofib:

        Program           Size    Allocs   Runtime   Elapsed
            Min          +0.3%    -63.0%    -38.5%    -38.7%
            Max          +1.2%     +0.2%     +0.9%     +0.9%
 Geometric Mean          +0.6%     -3.0%     -6.4%     -6.6%