RFR(S): 8222295 more baseline cleanups from Async Monitor Deflation project

[Daniel D. Daugherty]

Greetings,

I have a (S)mall patch extracted from the Async Monitor Deflation project
that is ready for code review.

Karen, a number of the changes here are from your code review comments
to the parent bug:

     JDK-8153224 Monitor deflation prolong safepoints
     https://bugs.openjdk.java.net/browse/JDK-8153224

The short version of what this patch is about:

     More baseline cleanups to the ObjectMonitor subsystem.

The details are in the bug report:

     JDK-8222295 more baseline cleanups from Async Monitor Deflation project
     https://bugs.openjdk.java.net/browse/JDK-8222295

Here's the webrev:

http://cr.openjdk.java.net/~dcubed/8153224-webrev/4-for-jdk13.8222295/

This patch along with the current patch for Async Monitor Deflation
project have been through Mach5 tier[1-8] testing.

I have been actively using the revised assert()'s and guarantee()'s with
additional diagnostic info while debugging my port of the Async Monitor
Deflation project code.

Thanks, in advance, for any questions, comments or suggestions.

Dan