RFR: 8305734: Fixes bug in get(int, int)

[Andy-Tatman]

See https://bugs.java.com/bugdatabase/view_bug?bug_id=8305734

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Commit messages:
 - Update src/java.base/share/classes/java/util/BitSet.java
 - Removed trailing whitespace
 - 8305734: Fixes bug in get(int, int)

Changes: https://git.openjdk.org/jdk/pull/13388/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13388&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305734
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13388.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13388/head:pull/13388

PR: https://git.openjdk.org/jdk/pull/13388