RFR: JDK-8302820: Remove costs for NMTPreInit when NMT is off [v4]

[Thomas Stuefe]

On Thu, 2 Mar 2023 14:30:23 GMT, Andrew Dinn <adinn at openjdk.org> wrote:

> > The latest version of my patch from tonight already frees the LU table nodes (see nmtPreinit.cpp 104ff). It was tested successfully tonight and in addition I ran x64 and x86 fastdebug release tests manually.
> 
> Ah ok, yes, I see the destructor implements option 1. I still like the idea of pursuing option 3 via a generic container if the cost of writing and maintaining it can be justified by other uses.

Me too. I'll do it in a separate RFE.

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PR: https://git.openjdk.org/jdk/pull/12642