RFR: 8273541: Cleaner Thread creates with normal priority instead of MAX_PRIORITY - 2

[kabutz]

…of MAX_PRIORITY-2 during refactoring

Appears in Java 17 for the first time.

During refactoring, the priority was changed from Thread.MAX_PRIORITY -  2 to instead state Thread.MIN_PRIORITY - 2, which results in a negative priority, and is thus set to Thread.NORM_PRIORITY. Thus the Cleaner by default now has threads with priority 5, instead of 8.

The change was done in git revision # 992b50087d2ec8878dfcbbd1820a00b6b6bdf644 and label 8261036 by Claes Redestad

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Commit messages:
 - Merge branch 'openjdk:master' into thread_priority
 - Merge remote-tracking branch 'origin/thread_priority' into thread_priority
 - Merge branch 'openjdk:master' into thread_priority
 - Merge branch 'openjdk:master' into thread_priority
 - Merge branch 'openjdk:master' into thread_priority
 - Redo the change to MAX_PRIORITY - 2
 - Removed stray "java"
 - Thread priority of Cleaner threads was set to MIN_PRIORITY-2 instead of MAX_PRIORITY-2 during refactoring

Changes: https://git.openjdk.java.net/jdk/pull/5439/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5439&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/jdk/pull/5439.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5439/head:pull/5439

PR: https://git.openjdk.java.net/jdk/pull/5439