[foreign-preview] RFR: Remove workarounds for issue surrounding upcalls and deoptimizations. [v2]

[Maurizio Cimadamore]

On Mon, 31 Jan 2022 14:45:42 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Please review this patch which removes the (partial) workaround in aarch64 upcall code for spilling the receiver during a deopt. This has been properly fixed in the mainline by: https://github.com/openjdk/jdk/pull/6522 instead.
>> 
>> It also restores the lazy-customization behavior of upcalls which was removed to work around the same issue (originally added by: https://github.com/openjdk/panama-foreign/pull/553).
>> 
>> Thanks,
>> Jorn
>
> Jorn Vernee has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - Rebase fixes
>  - Remove deopt spill space from aarch64 as well
>  - Re-drop ensureCustomized

Re-approving

-------------

Marked as reviewed by mcimadamore (Committer).

PR: https://git.openjdk.java.net/panama-foreign/pull/625