hg: jdk/sandbox: 8241581: Add BitMap::count_one_bits variant for arbitrary lengths

[chris.hegarty at oracle.com]

Changeset: 55b8fc5c9052
Author:    stuefe
Date:      2020-03-27 07:16 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/55b8fc5c9052

8241581: Add BitMap::count_one_bits variant for arbitrary lengths
Reviewed-by: redestad, kbarrett

! src/hotspot/share/utilities/bitMap.cpp
! src/hotspot/share/utilities/bitMap.hpp
+ test/hotspot/gtest/utilities/test_bitMap_popcnt.cpp