[11u] RFR: 8185005: Improve performance of ThreadMXBean.getThreadInfo(long ids[], int maxDepth)

[Lindenmaier, Goetz]

Hi

I had to do some trivial resolves due to context in mutexLocker.h|cpp  to downport this:

http://cr.openjdk.java.net/~goetz/wr20/8185005-getThreadInfo_performance-jdk11/01/
https://bugs.openjdk.java.net/browse/JDK-8185005
https://hg.openjdk.java.net/jdk/jdk/rev/f4abe950c3b0

Best regards,
  Goetz.