Jack Styles 6aac30fa43 Update FEAT_PAuth_LR behaviour for AArch64 (#90614) ...

Currently, LLVM enables `-mbranch-protection=standard` as `bti+pac-ret`.
To align LLVM with the behaviour in GNU, this has been updated to
`bti+pac-ret+pc` when FEAT_PAuth_LR is enabled as an optional feature
via the `-mcpu=` options. If this is not enabled, then this will revert
to the existing behaviour.

2024-05-10 08:09:02 +01:00

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