std.math.big.int: fix shiftRight sign handling #21320
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Closes ziglang#21311 The sign of the result `r` needs to be initialized before the correction `r.addScalar(r.toConst(), -1)`, or the intended end result could be off by 2 (depending on the original sign of `r`).
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Closes #21311
The sign of the result
rneeds to be initialized before the correctionr.addScalar(r.toConst(), -1), or the intended end result could be off by 2 (depending on the original sign ofr).