RFR: JDK-8256844: Make NMT late-initializable [v2]

[Coleen Phillimore]

On Fri, 30 Jul 2021 09:32:22 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> [Not a review, just a drive-by comment.]  This is a normal and idiomatic overload on the const-ness of `this`.
>
> To expand on Kim's answer. This is a way to solve const/nonconst problems like https://github.com/openjdk/jdk/pull/4938/files#r679639391. 
> 
> You get a const version (suitably returning a write-protected pointer) which the compiler chooses in const code, and a non-const version for non-const code, and no awkward const-casts are needed from the outside.
> 
> In this case the implementation is simple enough that I just duplicated it; were it more complex, I'd call one in terms of the other. We do this in other places too, see e.g. `ResourceHashTable::lookup_node`.

This is ok. This was just new to me.

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PR: https://git.openjdk.java.net/jdk/pull/4874