RFR: 8305895: Implement JEP 450: Compact Object Headers (Experimental) [v21]

[Thomas Stuefe]

On Thu, 19 Sep 2024 13:08:43 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Yes, please, not having this code would be really nice.  This is difficult code.
>
> Do you seen any effects of this in anything other than special-crafted micro benchmarks? I wonder if it would be good enough to hard-code this to be 10 for the first integration of Lilliput.

I will do some benchmarks

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PR Review Comment: https://git.openjdk.org/jdk/pull/20677#discussion_r1766848371