Pedro F. Giffuni bdd8abc6d6 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)
2019-01-07 17:35:09 +00:00
..
2018-12-31 15:43:06 +00:00