FFM performance tweaks

[Maurizio Cimadamore]

Hi,
some performance tweaks have landed in the JDK 24 early access build 
(build 24):

https://jdk.java.net/24/

They are:

https://git.openjdk.org/jdk/pull/21764
https://git.openjdk.org/jdk/pull/21810

The former contains some optimizations for `MemorySegment

` which should improve scalarization - see [1]. The second contains an 
improvement to the way we perform the liveness check, which should make 
such check provably redundant for segments backed by the global arena. 
This should improve the performance of workarounds using an “everything” 
segment to access off-heap memory with minimal impact from bound checks [2].

As JDK 24 is moving closer to rampdown phase [3], it would be great to 
give such changes a try and report back.

Cheers
Maurizio

[1] - https://mail.openjdk.org/pipermail/panama-dev/2024-October/020702.html
[2] - https://mail.openjdk.org/pipermail/panama-dev/2024-October/020736.html
[3] - https://openjdk.org/projects/jdk/24/

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