[llvm] [PAC][AArch64] Lower ptrauth constants in code (PR #94241)

[Daniil Kovalev via llvm-commits]

kovdan01 wrote:

> You added a new GlobalIsel named opcode. You may want to check it's invariants in the MachineVerifier: https://github.com/llvm/llvm-project/blob/main/llvm/lib/CodeGen/MachineVerifier.cpp

Thanks for suggestion! I've added some basic invariant checking.

https://github.com/llvm/llvm-project/pull/94241