RFR: 8280289: Enhance debug pp() command with NMT info [v3]

[Zhengyu Gu]

On Mon, 24 Jan 2022 13:59:09 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> Can the printing be done inside do_allocation_site() instead? That way we are holding the ThreadCritical that will prevent concurrent NMT record/remove operations.
>
> Yes, we can. But I think dealing with malloc'd memory is more problematic, if call triggers concurrent execution.
> 
> I am going to withdraw this for now and take another look how debuggers behave.
> 
> Thanks

gdb also resumes all threads upon function call.

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PR: https://git.openjdk.java.net/jdk/pull/7160