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

[Andrew Haley]

On Mon, 7 Feb 2022 11:42:43 GMT, Alan Hayward <duke at openjdk.java.net> wrote:

>> Because enter always enters a subframe. That's what it's for.
>
> enter_nested() ?
> enter_inner() ?

Tell you what, first put a comment here that says when it should (and therefore, should not) be used. Once it's clear exactly what this is for, thinking of a name maight be easier.

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