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Animesh TrivediUwe L. Korn
5a001e0270b
Animesh Trivedi authored and Uwe L. Korn committed 49f3086a67a
ARROW-3891: [Java] Remove Long.bitCount with simple bitmap operations

to check if a bit is set or not, there is no need to count
number of bits set in a long. A simple shift and bitwise AND
is sufficient (and faster!).

Signed-off-by: Animesh Trivedi <atrivedi@apache.org>

Author: Animesh Trivedi <atrivedi@apache.org>

Closes #3039 from animeshtrivedi/ARROW-3891 and squashes the following commits:

0d9ceeb6 <Animesh Trivedi> ARROW-3891:  Remove Long.bitCount with simple bitmap operations