[jdk11u-dev] RFR: 8273541: Cleaner Thread creates with normal priority instead of MAX_PRIORITY - 2

[Martin Doerr]

Clean backport of JDK-8273541.

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Depends on: https://git.openjdk.java.net/jdk11u-dev/pull/353

Commit messages:
 - Backport 4e6de5f9defc031158e027bcbbaf6232b8c03d60

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/354/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=354&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273541
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/354.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/354/head:pull/354

PR: https://git.openjdk.java.net/jdk11u-dev/pull/354