pow(3): Workaround possible signed shift Undefined Behavior.
j is int32_t and thus j<<31 is undefined if j==1.
Hinted by: muusl-lib (git 688d3da0f1730daddbc954bbc2d27cc96ceee04c)
Discussed with: freebsd-numerics (kargl)
pow(3): Workaround possible signed shift Undefined Behavior. Tags None Referenced Files None Subscribers None
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