[llvm] [AArch64][PAC] Rework discriminator analysis in AUT and AUTPAC (PR #146489)

[Daniil Kovalev via llvm-commits]

kovdan01 wrote:

@pcc Could you please take a look at this? Can these changes potentially cause issues with the features you are currently working on (e.g. struct protection)?

>From my side, this LGTM, but it would be very nice if you could also look through the changes.

https://github.com/llvm/llvm-project/pull/146489