RFR: 8287385: Suppress superficial unstable_if traps

[Xin Liu]

8287385: Suppress superficial unstable_if traps

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Commit messages:
 - 8287385: Suppress superficial unstable_if traps

Changes: https://git.openjdk.org/jdk/pull/9601/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9601&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287385
  Stats: 92 lines in 5 files changed: 71 ins; 6 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/9601.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9601/head:pull/9601

PR: https://git.openjdk.org/jdk/pull/9601