RFR: 8300926: Several startup regressions ~6-70% in 21-b6 all platforms [v3]

[Robbin Ehn]

On Tue, 21 Feb 2023 08:06:49 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Review fixes 2
>
> @coleenp was these the changes you were looking for?
> Passes t1-t7

> @robehn - I forgot to ask: what testing has been run on the more recent version(s)?

All versions moving DeoptScope/Compile_lock have been tested to tier 8, assert changes and such to tier 5.

But I notice UseVtableBasedCHA seems only be turned off in one test, so I started to go over the compiler code, which added some concerns which I need to eliminate.

I'll keep fixing review issue while looking into that.

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PR: https://git.openjdk.org/jdk/pull/12585