RFR: 8288926: make runtime/logging/DeoptStats.java more reliable

[Xin Liu]

8288926: make runtime/logging/DeoptStats.java more reliable

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Commit messages:
 - 8288926: make runtime/logging/DeoptStats.java more reliable

Changes: https://git.openjdk.org/jdk/pull/9228/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9228&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288926
  Stats: 16 lines in 1 file changed: 9 ins; 5 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/9228.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9228/head:pull/9228

PR: https://git.openjdk.org/jdk/pull/9228