[master] RFR: JDK-8303823: [Lilliput] Inline initial LockStack stack [v2]

[Roman Kennke]

On Wed, 8 Mar 2023 17:16:51 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Inlines the initial lock stack. This gives us:
>> - Much higher chance of cache hits when accessing lockstack slots via lockstack header.
>> - postponed malloc call
>> - we use actually less memory (not that it matters much) per thread since malloc overhead is at least 48 bytes per allocation, probably more.
>> 
>> Also increases size of initial stack to two slots, and uses realloc instead of malloc+free when growing stack.
>
> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
> 
>   make init cap 4

FWIW, I've applied the change to upstream fast-locking PR: https://github.com/openjdk/jdk/pull/10907/commits/3beabad3599291f02425be17a5168effb5552e94

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PR: https://git.openjdk.org/lilliput/pull/80