Loop unroll fixes

[Richard Kenner]

    I'd expect that common configurey for all targets and front ends are
    affected by this, making this as much of a major feature as say, the
    C++ or Java FE's.

I don't follow your first point, but would certainly also not consider the
Java or C++ "major features" using the relevant definition, which isn't
how much it adds to the compiler, but relates instead to the chances of
it breaking something else.