RFR: Tweak jextract to work with latest API changes

Thu Jul 20 13:44:01 UTC 2023

On Thu, 20 Jul 2023 12:26:01 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This PR fixes a bunch of issues with jextract that were introduced by the latest changes in the Panama repo:
> 
> * All var handles now take an extra offset parameter. This required changes to the libclang generated bindings, as well as changes in the code generated by jextract.
> * The name of some allocation factories in SegmentAllocator has changed. This PR fixes jextract to use the right names.
> * ValueLayout::arrayElementVarHandle is no longer present

LGTM

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Marked as reviewed by sundar (Committer).

PR Review: https://git.openjdk.org/jextract/pull/124#pullrequestreview-1539297348