RFR: 8277204: Implement PAC-RET branch protection on Linux/AArch64 [v18]

[Alan Hayward]

On Thu, 10 Feb 2022 16:18:18 GMT, Andrew Haley <aph at openjdk.org> wrote:

>>> Doing this caused 7 failures across a full jtreg run, namely:
>> 
>> I'm glad we caught that.
>
> Status? Is branch protection really incompatible with PreserveFramePointer?

Eventually found a missing signing in the exception handling. I'm running the full suite now, so should hopefully get something posted tomorrow.

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PR: https://git.openjdk.java.net/jdk/pull/6334