RFR: 8277204: Implement PAC-RET branch protection on Linux/AArch64 [v25]

[Alan Hayward]

On Tue, 7 Feb 2023 07:55:58 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

>For now, we will just add a check into Graal that UseBranchProtection is not set, exiting the VM if it is

that sounds a better solution to me instead of:

> disable JVMCI if _rop_protection is parsed as "true"

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PR: https://git.openjdk.org/jdk/pull/6334