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

[Aleksey Shipilev]

On Thu, 25 May 2023 19:45:37 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`

This pull request has now been integrated.

Changeset: 2d1a3cbf
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/lilliput-jdk17u/commit/2d1a3cbfe6eaa3e553a5696a785bf5dc5a7322a3
Stats:     51 lines in 5 files changed: 47 ins; 0 del; 4 mod

8308901: [Lilliput/JDK17] Cherry-pick C2 prototype header improvements

Reviewed-by: rkennke

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PR: https://git.openjdk.org/lilliput-jdk17u/pull/27