RFR 8213150: Add verification for locking by VMThread

[coleen.phillimore at oracle.com]

Summary: extend verification for all locking not just VMOperations, and 
fix CLDG lock to not be taken by VM thread.

See bug comments for more details about this change.

Tested with tier1 all Oracle platforms, tier2-8 linux-x64-debug.

open webrev at http://cr.openjdk.java.net/~coleenp/2019/8213150.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8213150

Thanks,
Coleen