[lilliput-jdk17u:lilliput] RFR: 8308901: [Lilliput/JDK17] Cherry-pick C2 prototype header improvements [v2]

[Aleksey Shipilev]

On Thu, 25 May 2023 20:31:56 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> We need to pick up this improvement from upstream PR to Lilliput/JDK17:
>>   https://github.com/rkennke/jdk/commit/3a18945ce900e229331b1412002da4a6965e0764
>> 
>> Additional testing:
>>  - [ ] Linux x86_64 fastdebug `tier1`
>>  - [x] Linux x86_64 fastdebug `tier1` + `+UseCompactObjectHeaders`
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Missed LoadNode::Value hunk from the original patch

Tests are passing, I am integrating.

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PR Comment: https://git.openjdk.org/lilliput-jdk17u/pull/27#issuecomment-1564116688