Fix a missing mask in a hi+lo decomposition.  Thus bug made the extra precision in software useless, so hypotf() had some errors in the 1-2 ulp range unless there is extra precision in hardware (as happens on i386).
Fix a missing mask in a hi+lo decomposition.  Thus bug made the extra
precision in software useless, so hypotf() had some errors in the 1-2
ulp range unless there is extra precision in hardware (as happens on
i386).

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