RFR: 8303516: HFAs with nested structs/unions/arrays not handled correctly on AArch64

[Jorn Vernee]

On Thu, 2 Mar 2023 13:48:26 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Port of: https://github.com/openjdk/panama-foreign/pull/780 Which adds tests for nested structs/unions/arrays, and fixes an issue with nested HFAs on AArch64.
> 
> This PR also includes https://github.com/openjdk/panama-foreign/pull/765 which is required for the fix to apply cleanly.
> 
> Moving these change sets into the mainline now seems useful for the currently ongoing porting effort on PPC, as well as taking a load off of the JEP PR review which will come later.

I've also disabled the TestMacOsAArch64CallArranger test on x86, which was failing (this slipped through the review of the windows/aarch64 port)

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PR: https://git.openjdk.org/jdk/pull/12831