RFR: 8287325: AArch64: fix virtual threads with -XX:UseBranchProtection=pac-ret [v2]

[Hao Sun]

On Thu, 1 Jun 2023 01:13:08 GMT, Dean Long <dlong at openjdk.org> wrote:

> What I thinking was to use the absolute SP during call/return, but "relativize" it on continuation freeze and then rewrite to the new absolute address on thaw.

Thanks for your review.
But the exception is that the **fast path** in stack copying doesn't walk the frames.
In this case, I'm afraid we have no chance to "relativize" the SP.

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PR Comment: https://git.openjdk.org/jdk/pull/13322#issuecomment-1575899183