RFR: 8306930: Incorrect assert in BitMap::count_one_bits

[Fredrik Bredberg]

8306930: Incorrect assert in BitMap::count_one_bits

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Commit messages:
 - 8306930: Incorrect assert in BitMap::count_one_bits

Changes: https://git.openjdk.org/jdk/pull/13887/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13887&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306930
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13887.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13887/head:pull/13887

PR: https://git.openjdk.org/jdk/pull/13887