[jdk25u] RFR: 8364296: Set IntelJccErratumMitigation flag ergonomically

[Rui Li]

A clean backport for https://bugs.openjdk.org/browse/JDK-8337679

Add visibility of flag IntelJccErratumMitigation. In tip for around 1 month.

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Commit messages:
 - Backport 6c5804722b5b2064e0d6ade2180c3126d8f2dabc

Changes: https://git.openjdk.org/jdk25u/pull/195/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=195&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364296
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk25u/pull/195.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/195/head:pull/195

PR: https://git.openjdk.org/jdk25u/pull/195