RFR: 8287325: AArch64: fix virtual threads with -XX:UseBranchProtection=pac-ret [v5]

[Hao Sun]

On Tue, 5 Sep 2023 08:46:11 GMT, Andrew Haley <aph at openjdk.org> wrote:

> Thanks. I know that I suggested using a relative SP to sign the register value, but it's turned out to be something of a mess. So, I suggest that we go back to using zero as a key, and we can get this patch committed.
> 
Agree. I will revert to the implementation with "zero" modifier and do some tests. Thanks.

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PR Comment: https://git.openjdk.org/jdk/pull/13322#issuecomment-1707523192