RFR (S) 8222988: Use MonitorLocker rather than MutexLocker when wait/notify used

[coleen.phillimore at oracle.com]

Summary: fixed use cases in code except CMS.

This affects some GC code and runtime code.  It looks like a nice change 
to me.  Tested with hs tier1-3.

open webrev at http://cr.openjdk.java.net/~coleenp/2019/8222988.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8222988

Thanks,
Coleen