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

[Thorsten Schütt via llvm-commits]

tschuett wrote:

In the IRTranslator, you build a G_PTRAUTH_GLOBAL_VALUE by hand. Would an entry to
https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
simplify the build?

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