RFR: 8288477: nmethod header size reduction

[Vladimir Kozlov]

On Thu, 7 Jul 2022 22:53:12 GMT, Dean Long <dlong at openjdk.org> wrote:

> Most of the files changed are because of CompLevel. It feels a little disruptive. I'd rather do the minimal changes.
> 
> There is also a lot of unnecessary space used by these addresses: address _code_begin; address _code_end; address _content_begin; address _data_end; address _relocation_begin; address _relocation_end;
> 
> Now that AOT has been removed, we could go back to 3 int fields like in jdk8.

There is Leyden project for which we may need it.

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PR: https://git.openjdk.org/jdk/pull/9165