[Fractdev] shift by negative bits

in unix/fpu087.c, RegSftFloat:

    long RegSftFloat(x, Shift)
    long x;
    int Shift;
    {
        float f;
        f = em2float(x);
        if (Shift>0) {
        f *= (1<<Shift);
        } else {
        f /= (1<<Shift);
        }
        return float2em(f);
    }

When Shift is negative, it divides by 1 left-shifted by a negative
number of bits. Shouldn't this be 1 << -Shift instead?

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