[foreign-memaccess+abi] RFR: Remove workarounds for issue surrounding upcalls and deoptimizations.

[Jorn Vernee]

On Tue, 7 Dec 2021 18:24:35 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

@nick-arm Could you take a look at the aarch64 bits?

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