RFR: 8274178: Occupancy value in logging and JFR event is inaccurate in G1IHOPControl

[Man Cao]

Hi all,

Could we have reviews for this minor fix for logging and JFR event occupancy number for G1? See https://bugs.openjdk.java.net/browse/JDK-8274178 for more details.

This fix is contributed by colleague Jonathan Joo <jonathanjoo at google.com>.

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Commit messages:
 - Improve occupancy logging message for G1 IHOP

Changes: https://git.openjdk.java.net/jdk/pull/5762/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5762&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274178
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5762.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5762/head:pull/5762

PR: https://git.openjdk.java.net/jdk/pull/5762