RFR: JDK-8281460: Let ObjectMonitor have its own NMT category

[Aleksey Shipilev]

On Wed, 9 Feb 2022 09:44:48 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> It feels weird now :) but let us see if someone else objects. If yes, I withdraw this change.

Yeah, that looks a bit weird, and I have another question: why aren't both `ObjectMonitor` and `ObjectMonitorsHashtable` are `mtSynchronizer`?

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PR: https://git.openjdk.java.net/jdk/pull/7378