hg: jdk/sandbox: 8228692: BitMap::reallocate might not clear some bits

[chris.hegarty at oracle.com]

Changeset: e6781e25f307
Author:    kbarrett
Date:      2020-05-26 21:26 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/e6781e25f307

8228692: BitMap::reallocate might not clear some bits
Summary: Ensure trailing bits in last copied word are cleared.
Reviewed-by: tschatzl, sjohanss

! src/hotspot/share/utilities/bitMap.cpp
! test/hotspot/gtest/utilities/test_bitMap.cpp